Bug 8436: QA Follow-up: Activate branch filter, if IndependentBranches is off

Bug 8436: QA Follow-up: Activate branch filter, if IndependentBranches is off

The superserials permission is only in use in combination with
IndependentBranches - so it makes sense to also show the branch
filter when IndependentBranches is off.

Permission description:
 superserials Manage subscriptions from any branch
 (only applies when IndependentBranches is used)

Also adds a missing check for superlibraian.

Note: the duplicated permission check in the code is not really nice
- would be good to rewrite this to be more clean.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>