Added missing this on event listener in fusion sensor
Added missing this on event listener in fusion sensor

bkkl/bkkl.github.io,jsantell/webvr-polyfill,marciot/webvr-polyfill,immersive-web/webvr-polyfill,borismus/webvr-polyfill,jsantell/webvr-polyfill,bkkl/bkkl.github.io,marciot/webvr-polyfill,immersive-web/webvr-polyfill,borismus/webvr-polyfill