Rails4: replace deprecated Relation#update_all at Repository model

git-svn-id: http://svn.redmine.org/redmine/trunk@12493 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/repository.rb

@@ -402,7 +402,7 @@ class Repository < ActiveRecord::Base
       self.is_default = true
     end
     if is_default? && is_default_changed?
-      Repository.update_all(["is_default = ?", false], ["project_id = ?", project_id])
+      Repository.where(["project_id = ?", project_id]).update_all(["is_default = ?", false])
     end
   end