Bug 22445: (follow-up) Use CSS to set a max-width for images - Staff client

Bug 22445: (follow-up) Use CSS to set a max-width for images - Staff client

This patch adds some CSS and markup to staff client templates so that
custom cover images have a maximum width of 140px (to match the width of
generated local cover image thumbnails). This prevents oversized images
from displaying inconsistently compared to images from other services.

This patch also adds a missing </a> to fix display problems.

To test, apply the patch and regenerate the staff client CSS. Post an
oversized image which corresponds to a record in your catalog.

View the following pages to confirm that the image displays well:

 - Catalog search results
 - Bibliographic detail page

Sponsored-by: Orex Digital
Signed-off-by: Hayley Mapley <hayleymapley@catalyst.net.nz>
Signed-off-by: Hugo Agud <hagud@orex.es>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Kyle Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>