Use enum validation instead of ArgumentError rescue for List replies policy check (#34452)

app/controllers/api/v1/lists_controller.rb

@@ -7,10 +7,6 @@ class Api::V1::ListsController < Api::BaseController
   before_action :require_user!
   before_action :set_list, except: [:index, :create]
 
-  rescue_from ArgumentError do |e|
-    render json: { error: e.to_s }, status: 422
-  end
-
   def index
     @lists = List.where(account: current_account).all
     render json: @lists, each_serializer: REST::ListSerializer