fix(rn-sdk): allow prop component ParticipantVideoFallback in FloatingParticipantView

[kristian-mkd]

Fixes the customisation option in the FloatingParticipantView for a ParticipantVideoFallback component.

  const customParticipantVideoFallback = () => {
    return (
      <View
        style={[
          {
            ...
            backgroundColor: 'orange',
          },
        ]}
      >
        <View style={{ height: 30, width: 30 }}>
          <VideoSlash color={'green'} size={30} />
        </View>
      </View>
    );
  };

<FloatingParticipantView
  ParticipantVideoFallback={customParticipantVideoFallback}
/>