use feedback api instead of app=

www/drive/main.js

@@ -2243,6 +2243,7 @@ define([
 
     // don't initialize until the store is ready.
     Cryptpad.ready(function () {
+        Cryptpad.reportAppUsage();
         APP.$bar = $iframe.find('#toolbar');
 
         var storeObj = Cryptpad.getStore().getProxy && Cryptpad.getStore().getProxy().proxy ? Cryptpad.getStore().getProxy() : undefined;