Bug 29603: Fix responsive behavior of facets menu in OPAC search results

Bug 29603: Fix responsive behavior of facets menu in OPAC search results

The OPAC was originally featured a search results facets box that would
collapse at narrower browser widths and show a "Refine your search" link
under the breadcrumbs menu. At some point this broke, with the "Refine
your search" link appearing at the bottom instead.

This patch revises the page to restore the previous behavior.

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 catalog search in the OPAC which will return multiple results.
- View the page at various browser widths. At narrower widths the facets
  menu should appear as a "collapsed" box with a "Refine your search"
  link.
- Clicking the link should toggle the facets menu visibility.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>