Bug 1488055 - followup fix to enable the click handler actor in sidebar, r=mconley

Depends on D5196

Differential Revision: https://phabricator.services.mozilla.com/D5780

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

browser/components/nsBrowserGlue.js

@@ -71,7 +71,6 @@ let ACTORS = {
   ClickHandler: {
     child: {
       module: "resource:///actors/ClickHandlerChild.jsm",
-      group: "browsers",
       events: {
         "click": {capture: true, mozSystemGroup: true},
       },