Fix sender reference in LOADING_COMPLETED payload. Strangely, the listener (in FragmentMaodel) seems to have the reference of the parent instance (File dash.js issue btw?)
Fix sender reference in LOADING_COMPLETED payload. Strangely, the listener
(in FragmentMaodel) seems to have the reference of the parent instance
(File dash.js issue btw?)

streamroot/dashjs-p2p-wrapper,streamroot/dashjs-p2p-wrapper,streamroot/dashjs-p2p-wrapper