Fix update icon-class for 3p cookie blocking in incognito

Fix the cookie-controls-changed listener to update the correct element
for the incognito ntp.

Bug: 1046352
Change-Id: I301f63304f15a81a4ac029d6d6445e3848d39b74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035963Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738230}

chrome/browser/resources/ntp4/incognito_tab.js

@@ -13,9 +13,9 @@ window.addEventListener('load', function() {
 
   cr.addWebUIListener('cookie-controls-changed', dict => {
     $('cookie-controls-tooltip-icon').hidden = !dict.enforced;
+    $('cookie-controls-tooltip-icon').iconClass = dict.icon;
     $('cookie-controls-toggle').disabled = dict.enforced;
     $('cookie-controls-toggle').checked = dict.checked;
-    $('cookie-controls-toggle').iconClass = dict.icon;
   });
   $('cookie-controls-toggle').addEventListener('change', event => {
     chrome.send('cookieControlsToggleChanged', [event.detail]);