Bug 38231: Adjust CSS for search result controls in the OPAC

Bug 38231: Adjust CSS for search result controls in the OPAC

This patch makes some markup and CSS changes to the OPAC so that
controls are aligned correctly in the "mobile" view's catalog search
results. The patch also removes the border from the controls... I think
the borders looks out of place.

To test apply the patch and rebuild the OPAC CSS.

- Perform a catalog search.
- Check the styling of the controls shown for each search result, e.g.
  Place hold, Add tg, Save to lists, etc.
  - Make sure the controls work well when the browser window is various
    widths, from ~600px and up.

Sponsored-by: Athens County Public Libraries
Signed-off-by: Yanjun Li <yanjun.li@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>