Suspended actors don't need refreshing

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mobilizon/actors/actors.ex

@@ -1282,11 +1282,13 @@ defmodule Mobilizon.Actors do
   @doc """
   Whether the actor needs to be updated.
 
-  Local actors obviously don't need to be updated
+  Local actors obviously don't need to be updated, neither do suspended ones
   """
   @spec needs_update?(Actor.t()) :: boolean
   def needs_update?(%Actor{domain: nil}), do: false
 
+  def needs_update?(%Actor{suspended: true}), do: false
+
   def needs_update?(%Actor{last_refreshed_at: nil, domain: domain}) when not is_nil(domain),
     do: true