Fixes db/schema version number

What does this MR do?

Fixes db schema version number on EE.

It's correct on CE https://gitlab.com/gitlab-org/gitlab-ce/blob/master/db/schema.rb#L13

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/12911