Bug 35576: Add classes to hq-callnumber column in holds report

Bug 35576: Add classes to hq-callnumber column in holds report

To test:
1. APPLY PATCH
2. Make sure you have item.itemcallnumber data.
3. Have some holds and build the holds queue: perl /kohadevbox/koha/misc/cronjobs/holds/build_holds_queue.pl
4. To make testing easier add the following to IntranetUserCSS:
    .hq-callnumber .location { background: lightblue; }
    .hq-callnumber .itemcallnumber { background: lightgoldenrodyellow; }
5. Run the holds queue and notice that the data in the 'Call number' column has a lightblue (location) and lightgoldenrodyellow (call number) background.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>