Default to max 5 activities that are shown for organs

Should help for when organs organise many different activities, for
example, during a lustrum week.

module/Frontpage/src/Controller/OrganController.php

@@ -59,7 +59,7 @@ public function organAction(): ViewModel
         }
 
         $organMemberInformation = $this->organService->getOrganMemberInformation($organ);
-        $activities = $this->activityQueryService->getOrganActivities($organ, 3);
+        $activities = $this->activityQueryService->getOrganActivities($organ, 5);
 
         return new ViewModel(
             array_merge(