Bug 7833 - unique holiday link broken

Bug 7833 - unique holiday link broken

As Nicole stated on the bug the branchcode was missing from the links.

To test:
- add unique holidays to calendar for different branches
- click on link and check that the date is opened in the right calendar

Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Clicked links for unique holidays and exceptions for
multiple branches and everything works perfectly.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>