added missing cleanup in OdometryViewer app
added missing cleanup in OdometryViewer app

MASKOR/rtabmap,MASKOR/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,markusgrotz/rtabmap,MASKOR/rtabmap,chen0510566/rtabmap