Fix sign-up restrictions based on IP addresses not being enforced (#15607)

Fixes #15606

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/models/user.rb

@@ -152,7 +152,7 @@ class User < ApplicationRecord
 
   def confirm
     new_user      = !confirmed?
-    self.approved = true if open_registrations?
+    self.approved = true if open_registrations? && !sign_up_from_ip_requires_approval?
 
     super