refactor: improve groups LiveView based on code review feedback

lib/membership/membership.ex

@@ -274,18 +274,18 @@ defmodule Mv.Membership do
 
   """
   def get_group_by_slug(slug, opts \\ []) do
-    actor = Keyword.get(opts, :actor)
-    load_opts = Keyword.get(opts, :load, [:members, :member_count])
+    load = Keyword.get(opts, :load, [])
 
     require Ash.Query
 
     query =
       Mv.Membership.Group
       |> Ash.Query.filter(slug == ^slug)
-      |> Ash.Query.load(load_opts)
+      |> Ash.Query.load(load)
 
-    opts_with_actor = if actor, do: [actor: actor], else: []
-
-    Ash.read_one(query, opts_with_actor)
+    opts
+    |> Keyword.delete(:load)
+    |> Keyword.put_new(:domain, __MODULE__)
+    |> then(&Ash.read_one(query, &1))
   end
 end