Fix bug on the OAuth client deauthorization page

An exception was raised when a user tried to go to the authroization page
this occured when we changed the field names on the models from "user" to
actor. This patch corrects the query and resolves the error.

mediagoblin/edit/views.py

@@ -293,7 +293,7 @@ def deauthorize_applications(request):
                 _("Application has been deauthorized")
             )
 
-    access_tokens = AccessToken.query.filter_by(user=request.user.id)
+    access_tokens = AccessToken.query.filter_by(actor=request.user.id)
     applications = [(a.get_requesttoken, a) for a in access_tokens]
 
     return render_to_response(