Shorten update spinner fadeout on status page

Change-Id: Iba951db42ac50b8f7dfece7d1a4af4c2ffc26afc
diff --git a/etc/status/public_html/app.js b/etc/status/public_html/app.js
index 09aa6ca..a397121 100644
--- a/etc/status/public_html/app.js
+++ b/etc/status/public_html/app.js
@@ -438,7 +438,7 @@
         $container.removeClass('zuul-container-loading');
         setTimeout(function () {
             $indicator.removeClass('zuul-spinner-on');
-        }, 550);
+        }, 500);
     });
 
     $jq.one('update-end', function () {