Add validation of Opera Web RTC settings

{"ops":[{"insert":"During pre-release testing found that on some Opera browser configurations - Web RTC is dead for STUN type of connection. And currently working on self-hosted TURN server is just not a priority.\nTo resolve this issue - for now need to add logic that will check if player is unable to connect to All players in the game session (if only one is an issue - then don't flag Web RTC as disabled).\nAnd in case if system suspects Web RTC as disabled - show pop-up with instructions how to enabled it.\n"}]}