Fix crashing resuable medium order position migration

[robbi5]

The SQLITE_CONSTRAINT_NOTNULL somehow is not happy with LEFT JOIN + WHERE ... IS NOT NULL. Using an (inner) join fixes that.

Crash:

android.database.sqlite.SQLiteConstraintException: NOT NULL constraint failed: ReusableMedium_OrderPosition.OrderPositionId (code 1299 SQLITE_CONSTRAINT_NOTNULL)
at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method)
at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:913)
at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:756)
at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:67)
at androidx.sqlite.db.framework.FrameworkSQLiteStatement.executeUpdateDelete(FrameworkSQLiteStatement.android.kt:34)
at app.cash.sqldelight.driver.android.AndroidPreparedStatement.execute(AndroidSqliteDriver.kt:261)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.execute$lambda$10(AndroidSqliteDriver.kt:184)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.$r8$lambda$On4hAq_M-pNnyeUgfFbsObZI6Yw(Unknown Source:0)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver$$ExternalSyntheticLambda4.invoke(D8$$SyntheticClass:0)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.execute-zeHU3Mk(AndroidSqliteDriver.kt:169)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.execute(AndroidSqliteDriver.kt:184)
at app.cash.sqldelight.db.SqlDriver$DefaultImpls.execute$default(SqlDriver.kt:63)
at eu.pretix.pretixscan.sqldelight.app.SyncDatabaseImpl$Schema.migrateInternal-ElmaSbI(SyncDatabaseImpl.kt:896)
at eu.pretix.pretixscan.sqldelight.app.SyncDatabaseImpl$Schema.migrate-zeHU3Mk(SyncDatabaseImpl.kt:935)
at eu.pretix.pretixscan.sqldelight.app.SyncDatabaseImpl$Schema.migrate(SyncDatabaseImpl.kt:168)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver$Callback.onUpgrade(AndroidSqliteDriver.kt:215)
at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.onUpgrade(FrameworkSQLiteOpenHelper.android.kt:245)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:416)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:316)
at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getWritableOrReadableDatabase(FrameworkSQLiteOpenHelper.android.kt:224)
at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.innerGetDatabase(FrameworkSQLiteOpenHelper.android.kt:180)
at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper$OpenHelper.getSupportDatabase(FrameworkSQLiteOpenHelper.android.kt:141)
at androidx.sqlite.db.framework.FrameworkSQLiteOpenHelper.getWritableDatabase(FrameworkSQLiteOpenHelper.android.kt:96)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.database_delegate$lambda$0(AndroidSqliteDriver.kt:41)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.$r8$lambda$-C5KwUQefNh6zT_6DC4RQ8hhrAo(Unknown Source:0)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver$$ExternalSyntheticLambda2.invoke(D8$$SyntheticClass:0)
at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:86)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.getDatabase(AndroidSqliteDriver.kt:40)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.executeQuery_0yMERmw$lambda$11(AndroidSqliteDriver.kt:192)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.$r8$lambda$DVkno8MHZS_Nyt__IJpDt7Bqbs4(Unknown Source:0)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver$$ExternalSyntheticLambda0.invoke(D8$$SyntheticClass:0)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.execute-zeHU3Mk(AndroidSqliteDriver.kt:163)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.executeQuery-0yMERmw(AndroidSqliteDriver.kt:192)
at app.cash.sqldelight.driver.android.AndroidSqliteDriver.executeQuery(AndroidSqliteDriver.kt:29)
at app.cash.sqldelight.SimpleQuery.execute(Query.kt:98)
at app.cash.sqldelight.ExecutableQuery.executeAsOneOrNull(Query.kt:198)
at app.cash.sqldelight.ExecutableQuery.executeAsOne(Query.kt:188)
at eu.pretix.pretixscan.droid.ui.MainActivity.reloadSyncStatus(MainActivity.kt:357)
at eu.pretix.pretixscan.droid.ui.MainActivity.reload(MainActivity.kt:216)
at eu.pretix.pretixscan.droid.ui.MainActivity.onResume(MainActivity.kt:782)
at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1564)
at android.app.Activity.performResume(Activity.java:8474)
at android.app.ActivityThread.performResumeActivity(ActivityThread.java:4764)
... 13 more