VC/Zoom: fix initial value of host muting flag
VC/Zoom: fix initial value of host muting flag

ThiefMaster/indico-plugins,ThiefMaster/indico-plugins,ThiefMaster/indico-plugins,ThiefMaster/indico-plugins,indico/indico-plugins,indico/indico-plugins,indico/indico-plugins,indico/indico-plugins