Enable negative interval literals test

Author: nene

test/expr/literal.test.ts

@@ -27,20 +27,13 @@ describe("literal", () => {
       dedent`
         SELECT
           INTERVAL 5 DAY,
+          INTERVAL -90 MINUTE,
           INTERVAL '10:20:30.52' HOUR TO SECOND,
           INTERVAL '1 5:30' DAY TO MINUTE
       `,
     );
   });
 
-  it.skip(`formats INTERVAL literals with negative value`, async () => {
-    await testBigquery(
-      dedent`
-        SELECT INTERVAL -90 MINUTE
-      `,
-    );
-  });
-
   it(`formats PostgreSQL INTERVAL literals`, async () => {
     await testPostgresql(
       dedent`