Bug 1609938 - Enable tab animation when closing the customize tab via ESC key or Done button. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D60248

--HG--
extra : moz-landing-system : lando

browser/components/customizableui/CustomizeMode.jsm

@@ -102,7 +102,7 @@ function closeGlobalTab() {
   if (win.gBrowser.browsers.length == 1) {
     win.BrowserOpenTab();
   }
-  win.gBrowser.removeTab(gTab);
+  win.gBrowser.removeTab(gTab, { animate: true });
   gTab = null;
 }