Detect FLARM missing from UpdateMonitor, and not from Parser.
Otherwise it would work only when using a multiplexer still sending nmea sentences.
	modified:   ../Header/Globals.h
	modified:   Comm/LKFlarm.cpp
	modified:   Comm/Parser.cpp
	modified:   Comm/UpdateMonitor.cpp
	modified:   Globals.cpp
	modified:   LKSimTraffic.cpp
Ensure we are not resetting global flags for a device gone silent more than one time.
	modified:   UpdateMonitor.cpp