fix(controller): set config as the issuing user

When you created new config values, the previous config's owner would
become the creator of this config. Removing this line allows the
request's user to become the owner.

controller/api/views.py

@@ -289,7 +289,6 @@ def pre_save(self, config):
         previous_config = config.app.config_set.latest()
         config.owner = self.request.user
         if previous_config:
-            config.owner = previous_config.owner
             for attr in ['cpu', 'memory', 'tags', 'values']:
                 # Guard against migrations from older apps without fixes to
                 # JSONField encoding.