Bug 13745: Fix serial collection page to always show branch name

Bug 13745: Fix serial collection page to always show branch name

The serial collection page shows 2 tables, one for the subscriptions
and a second for the issues. Both show the branch, but the first
showed the code while the second showed the name.
With this patch both tables show the name.

To test:
- Search for a subscription or create one
- Navigate to the serial collection page (navigation on left side)
- Check both tables on the page show the branch name with
  the patch applied

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>