Fix profiles not administrators able to edit a group

Related to #385

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

lib/mobilizon/actors/actors.ex

@@ -704,6 +704,22 @@ defmodule Mobilizon.Actors do
     )
   end
 
+  @spec is_moderator?(integer | String.t(), integer | String.t()) :: boolean()
+  def is_moderator?(actor_id, parent_id) do
+    match?(
+      {:ok, %Member{}},
+      get_member(actor_id, parent_id, @moderator_roles)
+    )
+  end
+
+  @spec is_administrator?(integer | String.t(), integer | String.t()) :: boolean()
+  def is_administrator?(actor_id, parent_id) do
+    match?(
+      {:ok, %Member{}},
+      get_member(actor_id, parent_id, @administrator_roles)
+    )
+  end
+
   @doc """
   Gets a single member of an actor (for example a group).
   """