chrome throw a permission denied exception if screen sharing + audio sharing
chrome throw a permission denied exception if screen sharing + audio sharing

add a test to remove audio sharing when starting screen sharing. I don't advise to force audio off in `setScreenCapture` since it would be surprising to lose audio when switch back to webcam sharing
priologic/easyrtc,mauricionr/easyrtc,linagora/easyrtc,bgawande/easyrtc,bgawande/easyrtc,chaudhary4k4/easyRTC,hthetiot/easyrtc,logoff/easyrtc,charlesAtNctu/easyrtc,xirsys/easyrtc,Hocalwire/easyrtc,cristiancvanega/easyrtc,thiagocarreno/easyrtc,ash24mish/easyrtc,chaudhary4k4/easyRTC,xirsys/easyrtc,ash24mish/easyrtc,Hocalwire/easyrtc,nmai/easyrtc,mauricionr/easyrtc,logoff/easyrtc,hthetiot/easyrtc,nmai/easyrtc,nmai/easyrtc,bradparks/easyrtc,Sylaps/easyrtc,Hocalwire/easyrtc,thiagocarreno/easyrtc,logoff/easyrtc,Hocalwire/easyrtc,charlesAtNctu/easyrtc,Sylaps/easyrtc,priologic/easyrtc,hthetiot/easyrtc,linagora/easyrtc,bgawande/easyrtc,mauricionr/easyrtc,udayshankar3/nodeapp,cristiancvanega/easyrtc,charlesAtNctu/easyrtc,Sylaps/easyrtc,bradparks/easyrtc,udayshankar3/nodeapp,thiagocarreno/easyrtc,ash24mish/easyrtc,bradparks/easyrtc,cristiancvanega/easyrtc,ash24mish/easyrtc,priologic/easyrtc,priologic/easyrtc