Make the app arg in @background functions a bit less magical

app/profile/tasks.py

@@ -1,4 +1,3 @@
-from .. import logger
 from ..decorators import background
 from ..models import User
 import os
@@ -6,13 +5,12 @@ import shutil
 
 
 @background
-def delete_user(app, user_id):
-    logger.warning('aufgerufen')
+def delete_user(user_id, *args, **kwargs):
+    app = kwargs['app']
     with app.app_context():
         user = User.query.get(user_id)
         if user is None:
             raise Exception('User {} not found!'.format(user_id))
-        logger.warning('deleting user')
         path = os.path.join(app.config['NOPAQUE_STORAGE'], str(user.id))
         shutil.rmtree(path, ignore_errors=True)
         user.delete()