Add ability to delete an event

lib/mobilizon/actors/user.ex

@@ -145,12 +145,12 @@ defmodule Mobilizon.Actors.User do
     {:ok, user}
   end
 
-  def owns_actor(%User{default_actor_id: default_actor_id} = user, %Actor{id: actor_id})
+  def owns_actor(%User{default_actor_id: default_actor_id}, %Actor{id: actor_id})
       when default_actor_id == actor_id do
     {:is_owned, true}
   end
 
-  def owns_actor(%User{actors: actors} = user, actor_id) do
+  def owns_actor(%User{actors: actors}, actor_id) do
     case Enum.any?(actors, fn a -> a.id == actor_id end) do
       true -> {:is_owned, true}
       _ -> {:is_owned, false}