feat(toolbar): implement toolbar background color via configOverwrite for web and mobile

* Change toolbar background color from IFrame API #16468 fixed

* fix(toolbar #16468): implement toolbar background color via configOverwrite for web and mobile

* keep toolbarConfig defaults commented in config.js

* add trailing comma to commented toolbarConfig.backgroundColor

* fix: resolve linting errors

Fixes #16468

modules/API/API.js

@@ -340,6 +340,7 @@ function initCommands() {
 
             APP.store.dispatch(setAssumedBandwidthBps(value));
         },
+
         'set-blurred-background': blurType => {
             const tracks = APP.store.getState()['features/base/tracks'];
             const videoTrack = getLocalVideoTrack(tracks)?.jitsiTrack;