LP#1929587 Place hold button in staff client

LP#1929587 Place hold button in staff client

This disables and re-styles the place hold button on search
results and record pages if the record is deleted or doesn't
have any holdable copies. This is similar to the OPAC, except
the OPAC hides the button, while this disables and greys out the
button.

To test:
* Search for records without any copies
* Search for records without holdable copies
* If using concerto data, a keyword search for map will give you
a mix of records with or without copies

Signed-off-by: Dan Briem <dbriem@wlsmail.org>