prevent create_merge_request form field helpers from generating an id value

app/views/projects/commit/_change.html.haml

@@ -24,10 +24,10 @@
                 .js-create-merge-request-container
                   .checkbox
                     = label_tag do
-                      = check_box_tag 'create_merge_request', 1, true, class: 'js-create-merge-request'
+                      = check_box_tag 'create_merge_request', 1, true, class: 'js-create-merge-request', id: nil
                       Start a <strong>new merge request</strong> with these changes
               - else
-                = hidden_field_tag 'create_merge_request', 1
+                = hidden_field_tag 'create_merge_request', 1, id: nil
           .form-actions
             = submit_tag label, class: 'btn btn-create'
             = link_to "Cancel", '#', class: "btn btn-cancel", "data-dismiss" => "modal"