Directly delete the "organization is invalid" error

We were getting a warning since upgrading to Rails 6.1:

DEPRECATION WARNING: Calling `delete` to an ActiveModel::Errors messages
hash is deprecated. Please call `ActiveModel::Errors#delete` instead.

So we're deleting the error instead of deleting the message.

app/controllers/account_controller.rb

@@ -10,7 +10,7 @@ class AccountController < ApplicationController
     if @account.update(account_params)
       redirect_to account_path, notice: t("flash.actions.save_changes.notice")
     else
-      @account.errors.messages.delete(:organization)
+      @account.errors.delete(:organization)
       render :show
     end
   end

app/controllers/organizations/registrations_controller.rb

@@ -13,7 +13,7 @@ class Organizations::RegistrationsController < Devise::RegistrationsController
     if resource.valid?
       super do |user|
         # Removes unuseful "organization is invalid" error message
-        user.errors.messages.delete(:organization)
+        user.errors.delete(:organization)
       end
     else
       render :new