Always validate inbox_url presence on Relay (#32364)

app/models/relay.rb

@@ -13,7 +13,7 @@
 #
 
 class Relay < ApplicationRecord
-  validates :inbox_url, presence: true, uniqueness: true, url: true, if: :will_save_change_to_inbox_url?
+  validates :inbox_url, presence: true, uniqueness: true, url: true # rubocop:disable Rails/UniqueValidationWithoutIndex
 
   enum :state, { idle: 0, pending: 1, accepted: 2, rejected: 3 }