Fix group usage quota menu item

Merged Alessio Caiazza requested to merge nolith-master-patch-30947 into master

What does this MR do?

During gitlab-ee!13294 development the Usage quota menu item was wrongly placed under the if @group.feature_available?(:audit_events) condition.

Does this MR meet the acceptance criteria?

Conformity

Performance and testing

Edited by Mayra Cabrera