MDL-48026 usermenu: convert menu nowrap from CSS to method

lib/outputrenderers.php

@@ -3044,6 +3044,7 @@ EOD;
             $returnstr
         );
         $am->set_alignment(action_menu::TR, action_menu::BR);
+        $am->set_nowrap_on_items();
         if ($withlinks) {
             $navitemcount = count($opts->navitems);
             $idx = 0;

theme/bootstrapbase/less/moodle/modules.less

@@ -567,7 +567,6 @@ div#dock {
                     }
 
                     a {
-                        white-space: nowrap;
                         border-radius: 0;
 
                         &:focus {