MDL-62139 output: Revert template changes

Revert accessibility changes for menus in standard themes.

lib/templates/action_menu_trigger.mustache

@@ -27,4 +27,4 @@
         "triggerextraclasses": ""
     }
 }}
-<a tabindex="0" class="{{triggerextraclasses}} toggle-display {{#menutrigger}}textmenu{{/menutrigger}}" id="action-menu-toggle-{{instance}}" aria-label="{{title}}" role="menuitem" aria-controls="action-menu-{{instance}}-menu">{{{actiontext}}}{{{menutrigger}}}{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{#rawicon}}{{{.}}}{{/rawicon}}{{#menutrigger}}<b class="caret"></b>{{/menutrigger}}</a>
+<a href="#" class="{{triggerextraclasses}} toggle-display {{#menutrigger}}textmenu{{/menutrigger}}" id="action-menu-toggle-{{instance}}" title="{{title}}" role="menuitem">{{{actiontext}}}{{{menutrigger}}}{{#icon}}{{#pix}}{{key}}, {{component}}, {{title}}{{/pix}}{{/icon}}{{#rawicon}}{{{.}}}{{/rawicon}}{{#menutrigger}}<b class="caret"></b>{{/menutrigger}}</a>

lib/tests/user_menu_test.php

@@ -96,8 +96,7 @@ test
         $dividercount += 2;
 
         // The basic entry count will additionally include the wrapper menu, Dashboard, Profile, Logout and switch roles link.
-        // On clean theme only, the trigger is also a menuitem.
-        $entrycount += 5;
+        $entrycount += 4;
 
         $output = $OUTPUT->user_menu($USER);
         preg_match_all('/<a [^>]+role="menuitem"[^>]+>/', $output, $results);