fix relocate after storing of cycle, fixes #1941

Closes #1941

Merge request studip/studip!1269

app/controllers/course/timesrooms.php

@@ -1117,7 +1117,7 @@ class Course_TimesroomsController extends AuthenticatedController
             words('day start_time end_time description cycle startWeek teacher_sws fromDialog course_type')
         );
 
-        $this->linkAttributes   = ['fromDialog' => Request::isXhr() ? 1 : 0];
+        $this->linkAttributes = ['fromDialog' => Request::bool('fromDialog')];
 
         $this->cycle = new SeminarCycleDate($cycle_id);