Resolve ""Meine Studiengruppen" für Admins sichtbar"

Closes #1097

Merge request studip/studip!653

app/controllers/studygroup.php

@@ -86,7 +86,7 @@ class StudygroupController extends AuthenticatedController
     {
         $sidebar = Sidebar::get();
 
-        if ($GLOBALS['perm']->have_perm('autor')) {
+        if ($GLOBALS['perm']->have_perm('autor') && !$GLOBALS['perm']->have_perm('admin')) {
             $actions = new ActionsWidget();
             $actions->addLink(
                 _('Neue Studiengruppe anlegen'),

lib/navigation/CommunityNavigation.php

@@ -70,7 +70,7 @@ class CommunityNavigation extends Navigation
         if (Config::get()->STUDYGROUPS_ENABLE) {
             $navigation = new Navigation(_('Studiengruppen'));
             $navigation->addSubNavigation('browse', new Navigation(_('Studiengruppensuche'), 'dispatch.php/studygroup/browse'));
-            if (Config::get()->MY_COURSES_ENABLE_STUDYGROUPS) {
+            if (Config::get()->MY_COURSES_ENABLE_STUDYGROUPS && !$GLOBALS['perm']->have_perm('admin')) {
                 $navigation->addSubNavigation('index', new Navigation(_('Meine Studiengruppen'), 'dispatch.php/my_studygroups'));
             }
             $this->addSubNavigation('studygroups', $navigation);