[Enhancement] Add option to use existing Media Profile as template for new profile (#466)

* Add option to use existing Media Profile as template for new profile

* Forgot to commit the edit form too

* Reset deletion mark on Source controller

* Add test for new preload profile feature

* mix check

lib/pinchflat_web/controllers/sources/source_controller.ex

@@ -67,7 +67,8 @@ defmodule PinchflatWeb.Sources.SourceController do
             collection_name: nil,
             collection_id: nil,
             collection_type: nil,
-            original_url: nil
+            original_url: nil,
+            marked_for_deletion_at: nil
         })
     )
   end