fix. samples

samples/simpleDemo/components/agora.js

         this.setState({
           joinSucceed: true
         })
-        const {peerIds} = this.state;
-        if (peerIds.indexOf(data.uid) === -1) {
-          this.setState({
-            peerIds: [...peerIds, data.uid]
-          })
-        }
       },
       onAudioVolumeIndication: (data) => {
         console.log('[RtcEngine] onAudioVolumeIndication', data);