LD App sent unused "DiagTlm" Message everytime it Wokeup #344
Description
In the LD App, the "DiagTlm" Message seemed to be used only for the multicopter.
But the "fixedwing" LD App also sent this Message everytime it executed "LD_WAKEUP_MID" with zero values.
And it showed that the "Landed is FALSE" at the same time the "VehicleLandDetectedMsg" showed "Landed: TRUE",
which may cause confusion.
- Test case: Test_LD_Execute_Landed()
