Add missing quotes in Snowplow integration

This was causing a "Uncaught ReferenceError: cf is not defined" in the
JavaScript console.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/60421

ee/app/views/layouts/_snowplow.html.haml

@@ -5,7 +5,7 @@
   };p[i].q=p[i].q||[];n=l.createElement(o);g=l.getElementsByTagName(o)[0];n.async=1;
   n.src=w;g.parentNode.insertBefore(n,g)}}(window,document,"script","#{asset_url('snowplow/sp.js')}","snowplow"));
 
-  window.snowplow('newTracker', #{Gitlab::SnowplowTracker::NAMESPACE}, '#{Gitlab::CurrentSettings.snowplow_collector_uri}', {
+  window.snowplow('newTracker', '#{Gitlab::SnowplowTracker::NAMESPACE}', '#{Gitlab::CurrentSettings.snowplow_collector_uri}', {
     appId: '#{Gitlab::CurrentSettings.snowplow_site_id}',
     cookieDomain: '#{Gitlab::CurrentSettings.snowplow_cookie_domain}',
     userFingerprint: false,