Rename validator method

Author: PetarSimonovic

app/models/school.rb

@@ -117,8 +117,8 @@ def import_in_progress?
                         .exists?(description: id)
   end
 
-  def email_domain_is_valid?(domain)
-    school_email_domains.exists?(domain)
+  def valid_domain?(candidate_domain)
+    school_email_domains.exists?(candidate_domain)
   end
 
   private