Resolve "CoreScm: Entfer nicht verwendete Methode"

Closes #4508

Merge request studip/studip!3298

lib/modules/CoreScm.php

@@ -155,9 +155,4 @@ class CoreScm extends CorePlugin implements StudipModule
         // TODO: Implement getInfoTemplate() method.
         return null;
     }
-
-    function deleteContent($course_id)
-    {
-
-    }
 }