fix(rn,build) fix use of "bare" relative path

The Metro bundler gets confused and the result of such import statements
is `undefined`.

react/features/base/participants/middleware.js

@@ -46,6 +46,7 @@ import {
     localParticipantLeft,
     participantLeft,
     participantUpdated,
+    raiseHand,
     raiseHandUpdateQueue,
     setLoadableAvatarUrl
 } from './actions';
@@ -64,12 +65,11 @@ import {
     getParticipantDisplayName,
     getRaiseHandsQueue,
     getRemoteParticipants,
+    hasRaisedHand,
     isLocalParticipantModerator
 } from './functions';
 import { PARTICIPANT_JOINED_FILE, PARTICIPANT_LEFT_FILE } from './sounds';
 
-import { hasRaisedHand, raiseHand } from '.';
-
 declare var APP: Object;
 
 /**