Noissue - Fix prefs unit tests, account for a changed default value

qunit/tests/prefs.js

 "use strict";
 
 (function()
 {
   const {Prefs} = require("prefs");
 
   module("Preferences", {
     setup()
     {
       this._pbackup = Object.create(null);
@@ skipping 29 matching lines @@
     let key = "pref:" + name;
     chrome.storage.local.get(key, items =>
     {
       deepEqual(items[key], expectedValue, description);
       done();
     });
   }
 
   test("Numerical pref", assert =>
   {
-    Prefs.patternsbackups = 5;
+    Prefs.patternsbackups = 0;
     equal(
-      Prefs.patternsbackups, 5,
+      Prefs.patternsbackups, 0,
       "Prefs object returns the correct value after setting pref to " +
       "default value"
     );
     checkPrefExists(
       "patternsbackups", false, "User-defined pref has been removed", assert
     );
     Prefs.patternsbackups = 12;
     equal(
       Prefs.patternsbackups, 12,
       "Prefs object returns the correct value after setting pref to " +
@@ skipping 91 matching lines @@
     delete Prefs.notificationdata.foo;
     delete Prefs.notificationdata.bar;
     Prefs.notificationdata = JSON.parse(JSON.stringify(Prefs.notificationdata));
     deepEqual(
       Prefs.notificationdata, {},
       "Prefs object returns the correct value after setting pref to " +
       "default value"
     );
   });
 }());