If changing mode to LOITER fails, fallback to ALT_HOLD #298
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We've seen a case where the drone entered
failsafe.GPS_GLITCH
state and remained in GUIDED mode. They tried to take manual control by changing mode to LOITER. The system refused to enter the LOITER mode, because of the GPS_GLITCH failsafe state.This PR introduces a fallback mechanism where it attempts to enter ALT_HOLD mode after a failed attempt to enter LOITER mode.