Bug 39072: Only select exact matches when populating search terms

This patch simply reduces our matching pattern to ensure the string is an exact match, rather than partial

To test:
- Create LOC authorized values of ADULT with description "Adult" and ADULTG with description "Adult - Grab and Go"
- Find a record with items and set one item to shelving location "Adult"
- Find a second record with items and set one item to shelving location "Adult - Grab and Go"
- Create an Item Search for Shelving location and select 'Adult' only
- Search and get one result from the record selected above
- Click Copy shareable link and paste/go in new tab
- See that the results now include both records from above
- Click Edit search button and notice that the Shelving location 'Adult - Grab and Go'  was added to the selected criteria for the search
- Apply patch
- Repeat original search for 'Adult' location
- Click 'Copy shareable link'
- Open in new tab and confirm correct results
- Repeat with a search for 'Adult - Grab and Go' and confirm shareable link gets the correct results

Signed-off-by: Brendan Lawlor <blawlor@clamsnet.org>

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 4d3ebcbe69)
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>

koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/itemsearch.tt

@@ -80,7 +80,7 @@
                 <option value="" selected="selected"> [% IF (empty_option) %][% INCLUDE form_label label=empty_option %][% ELSE %]<span>All</span>[% END %] </option>
             [% END %]
             [% FOREACH option IN options %]
-                [% IF query.param(name).grep(option.value).size %]
+                [% IF query.param(name).grep('^' _ option.value _ '$').size %]
                     <option value="[% option.value | html %]" selected="selected">[% option.label | html %]</option>
                 [% ELSE %]
                     <option value="[% option.value | html %]">[% option.label | html %]</option>