feat(BworserCapabilities): fix device change detection
feat(BworserCapabilities): fix device change detection

Safari 11 has `navigator.mediaDevices.ondevicechange` but doesn't define
`navigator.mediaDevices.addEventListener`. 🤦

Fixes: https://github.com/jitsi/lib-jitsi-meet/issues/823

damencho/lib-jitsi-meet,jitsi/lib-jitsi-meet,jitsi/lib-jitsi-meet,jiyeyuran/lib-jitsi-meet