Bug 27889: (follow-up) Adjust width of OpacAddMastheadLibraryPulldown

This patch adds some responsive classes to the
OpacAddMastheadLibraryPulldown container so that it will adjust better
at various browser widths.

Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/opac-tmpl/bootstrap/en/includes/masthead.inc

@@ -232,7 +232,7 @@
                                             </div> <!-- /.col -->
 
                                             [% IF ( Koha.Preference( 'OpacAddMastheadLibraryPulldown' ) == 1 ) %]
-                                                <div class="col-sm order-3 order-sm-4">
+                                                <div class="col-sm col-md-3 col-lg-2 order-3 order-sm-4">
                                                     <select name="branch_group_limit" id="select_library" class="form-control">
                                                         <option value="">All libraries</option>