Fix meta entry in patch_93_94_b.sql

Created by: mkszuba

Description

patch_93_94_b.sql incorrectly identified itself as _c in its entry in the meta table. Fixed.

Use case

The old behaviour introduced an inconsistency and could perhaps cause problems with automatic patching of databases.

Benefits

Patch _b is now correctly logged as _b in the meta table.

Possible Drawbacks

None I can think of.