[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/media_profiles/media_profile_html.ex

@@ -10,6 +10,7 @@ defmodule PinchflatWeb.MediaProfiles.MediaProfileHTML do
   """
   attr :changeset, Ecto.Changeset, required: true
   attr :action, :string, required: true
+  attr :method, :string, required: true
 
   def media_profile_form(assigns)