Script: Move SCRIPT_ERR_COUNT

SCRIPT_ERR_COUNT is a pseudo error that returns the number of errors.
It must always be last in the enum.

Author: uncomputable

src/script/script_error.h

@@ -82,8 +82,6 @@ typedef enum ScriptError_t
     SCRIPT_ERR_OP_CODESEPARATOR,
     SCRIPT_ERR_SIG_FINDANDDELETE,
 
-    SCRIPT_ERR_ERROR_COUNT,
-
     // ELEMENTS:
     SCRIPT_ERR_RANGEPROOF,
     SCRIPT_ERR_PEDERSEN_TALLY,
@@ -96,10 +94,13 @@ typedef enum ScriptError_t
     SCRIPT_ERR_INTROSPECT_INDEX_OUT_OF_BOUNDS,
     SCRIPT_ERR_EXPECTED_8BYTES,
     SCRIPT_ERR_ARITHMETIC64,
-    SCRIPT_ERR_ECMULTVERIFYFAIL
+    SCRIPT_ERR_ECMULTVERIFYFAIL,
+
+    /* Must go last */
+    SCRIPT_ERR_ERROR_COUNT
 } ScriptError;
 
-#define SCRIPT_ERR_LAST SCRIPT_ERR_ECMULTVERIFYFAIL
+#define SCRIPT_ERR_LAST SCRIPT_ERR_ERROR_COUNT
 
 std::string ScriptErrorString(const ScriptError error);