Bug 24996: Unwanted CSS change unhides OPAC results sorting button

Bug 24996: Unwanted CSS change unhides OPAC results sorting button

This patch adds back a CSS selector which was incorrectly removed by Bug
23915. The "Go" button associated with the OPAC search results resort
operation should be hidden if JavaScript is enabled.

To test, apply the patch and rebuild the OPAC CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client)

 - Perform a search in the OPAC
 - On the search results page, there should be no "Go" button next to
   the re-sort/results per page selection fields.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>