fix(rn,filmstrip) fix dropping tiles on conference join

react/features/filmstrip/subscriber.native.js

@@ -1,5 +1,6 @@
 // @flow
 
+import { getCurrentConference } from '../base/conference/functions';
 import { StateListenerRegistry } from '../base/redux';
 import { shouldDisplayTileView } from '../video-layout';
 
@@ -35,7 +36,7 @@ StateListenerRegistry.register(
  * Listens for changes in the current conference and clears remote participants from this feature.
  */
 StateListenerRegistry.register(
-    state => state['features/base/conference'].conference,
+    state => getCurrentConference(state),
     (conference, { dispatch }, previousConference) => {
         if (conference !== previousConference) {
             dispatch(setRemoteParticipants([]));