Bug 12386 - 'Days in advance' pull down in bootstrap OPAC is huge

Bug 12386 - 'Days in advance' pull down in bootstrap OPAC is huge

The "days in advance" form field on the "Your messaging settings" page
in the OPAC has a Bootstrap-default width which is too wide. This patch
adds a class to give it a more reasonable size.

To test you must have the EnhancedMessagingPreferences preference set to
"Allow." Log in to the OPAC and view the messaging settings page. The
dropdown menu of numbers should look correct.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>