Bug 13950: Sort Item search home library list by branch name

On the item search form the list of home libraries isn't sorted
alphabetically by their descrption.

To test:
- Ensure that you have libraries whose code/name are sorted in a different alphabetical order (e.g. Aardvark/ZZZ & Zebra/AAA)
- Staff: Advanced search - item search
- See that libraries are sorted in code order
- Apply patch
- Verify selection block for home library is correctly sorted after
  applying the patch.

Signed-off-by: Indranil Das Gupta (L2C2 Technologies) <indradg@gmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 958be9804a)
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

catalogue/itemsearch.pl

@@ -242,7 +242,7 @@ if ($format eq 'html') {
 
     my $branches = GetBranches();
     my @branches;
-    foreach my $branchcode (keys %$branches) {
+    foreach my $branchcode ( sort { uc($branches->{$a}->{branchname}) cmp uc($branches->{$b}->{branchname}) } keys %$branches) {
         push @branches, {
             value => $branchcode,
             label => $branches->{$branchcode}->{branchname},