feat: Whitelists enableUnifiedOnChrome.

Whitelists it, so we can run tests by setting it to false.

react/features/base/config/configWhitelist.js

@@ -129,6 +129,7 @@ export default [
     'enableSaveLogs',
     'enableScreenshotCapture',
     'enableTalkWhileMuted',
+    'enableUnifiedOnChrome',
     'enableNoAudioDetection',
     'enableNoisyMicDetection',
     'enableTcc',