Bug 14240: Add '(All libraries)' to notice deletion form

Bug 14240: Add '(All libraries)' to notice deletion form

Trivial patch that shows (All libraries) instead of an empty cell
for notices that are applicable across all libraries.

Test plan
=========
1) Log in to staff client
2) Tools->Notices & slips
3) Add a dummy notice for all libraries
   -- test code, test description, email - test subject, test content
      Click Submit
4) Click Delete
   -- note that the Library column value is blank.
5) Click the no option
6) Apply this patch
7) Click Delete
   -- note that the Library column value is (All Libraries).
8) run koha qa test tools.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>