fix(optimise): cope with URL interface config overrides

Regresssion from bd8a7edbd2.

When the toolbar buttons are overridden with URL parameters, our computed set of
buttons will be wrong. Thus, compute it every time and check for the
differences.

react/features/toolbox/components/web/Toolbox.js

@@ -28,7 +28,7 @@ import {
     getParticipants,
     participantUpdated
 } from '../../../base/participants';
-import { connect } from '../../../base/redux';
+import { connect, equals } from '../../../base/redux';
 import { OverflowMenuItem } from '../../../base/toolbox';
 import { getLocalVideoTrack, toggleScreensharing } from '../../../base/tracks';
 import { VideoBlurButton } from '../../../blur';
@@ -1330,6 +1330,10 @@ function _mapStateToProps(state) {
         }
     }
 
+    // NB: We compute the buttons again here because if URL parameters were used to
+    // override them we'd miss it.
+    const buttons = new Set(interfaceConfig.TOOLBAR_BUTTONS);
+
     return {
         _chatOpen: state['features/chat'].isOpen,
         _conference: conference,
@@ -1351,7 +1355,7 @@ function _mapStateToProps(state) {
             || sharedVideoStatus === 'start'
             || sharedVideoStatus === 'pause',
         _visible: isToolboxVisible(state),
-        _visibleButtons: visibleButtons
+        _visibleButtons: equals(visibleButtons, buttons) ? visibleButtons : buttons
     };
 }