Revert "Merge branch '569_cleanup_account_supervision_check_migration' into 'django3_migration'"

This reverts merge request !388 (merged)

"Refactoring" a migration has side effects on an existing database.

The migrations are recorded and thus doing this change we break the state and it's wrong.

Let's keep the migration as is for consistency.

changed milestone to %Code cleanup

added bug label

merged

mentioned in commit b282f739

mentioned in merge request !393 (merged)