fix(config-whitelist): remove props.

react/features/base/config/configWhitelist.ts

@@ -198,7 +198,9 @@ export default [
     'pcStatsInterval',
     'preferBosh',
     'preferVisitor',
-    'prejoinConfig',
+    'prejoinConfig.enabled',
+    'prejoinConfig.hideDisplayName',
+    'prejoinConfig.hideExtraJoinButtons',
     'prejoinPageEnabled',
     'raisedHands',
     'recordingService',

react/features/base/config/interfaceConfigWhitelist.ts

@@ -34,7 +34,6 @@ export default [
     'INDICATOR_FONT_SIZES',
     'INITIAL_TOOLBAR_TIMEOUT',
     'LANG_DETECTION',
-    'LIVE_STREAMING_HELP_LINK',
     'LOCAL_THUMBNAIL_RATIO',
     'MAXIMUM_ZOOMING_COEFFICIENT',
     'NATIVE_APP_NAME',