Bug 1654672: Remove logging for nonexistant zoom scalar. r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D85089

browser/components/BrowserGlue.jsm

@@ -2377,16 +2377,6 @@ BrowserGlue.prototype = {
         },
       },
 
-      {
-        task: () => {
-          let siteSpecific = Services.prefs.getBoolPref(
-            "browser.zoom.siteSpecific",
-            false
-          );
-          Services.telemetry.scalarSet("a11y.sitezoom", siteSpecific);
-        },
-      },
-
       // Load the Login Manager data from disk off the main thread, some time
       // after startup.  If the data is required before this runs, for example
       // because a restored page contains a password field, it will be loaded on