fix(RN): crash on undefined state['features/dynamic-branding']

react/features/app/reducers.any.js

 import '../deep-linking/reducer';
 import '../device-selection/reducer';
 import '../dropbox/reducer';
+import '../dynamic-branding/reducer';
 import '../etherpad/reducer';
 import '../filmstrip/reducer';
 import '../follow-me/reducer';

react/features/dynamic-branding/index.js

 export * from './actions';
 export * from './functions';
-
-import './reducer';