Remove approval_pending data attr to_s.

app/views/projects/merge_requests/widget/_open.html.haml

@@ -3,7 +3,7 @@
 
 - approval_pending = @merge_request.requires_approve? && !@merge_request.approved?
 
-#merge-request-widget-app.mr-state-widget{ 'data-endpoint'=> merge_request_path(@merge_request), 'data-approval-pending' => approval_pending.to_s }
+#merge-request-widget-app.mr-state-widget{ 'data-endpoint'=> merge_request_path(@merge_request), 'data-approval-pending' => approval_pending }
   = render 'projects/merge_requests/widget/heading'
   .mr-widget-body
     -# After conflicts are resolved, the user is redirected back to the MR page.