fix: Check phone_number and email changes are exist before validation (#4551)

app/models/contact.rb

@@ -145,13 +145,13 @@ class Contact < ApplicationRecord
   def phone_number_format
     return if phone_number.blank?
 
-    self.phone_number = changes['phone_number'].first unless phone_number.match?(/\+[1-9]\d{1,14}\z/)
+    self.phone_number = phone_number_was unless phone_number.match?(/\+[1-9]\d{1,14}\z/)
   end
 
   def email_format
     return if email.blank?
 
-    self.email = changes['email'].first unless email.match(Devise.email_regexp)
+    self.email = email_was unless email.match(Devise.email_regexp)
   end
 
   def prepare_contact_attributes