Plane: Removed scary autotakeoff message.

This message does not provide anything useful, but is rather scary to
get moments before launch.
If it's somehow meant to provide useful information, or an action "Timer
interrupted AUTO" should be replaced by something else.

ArduPlane/takeoff.cpp

@@ -17,7 +17,6 @@ bool Plane::auto_takeoff_check(void)
 
     // Reset states if process has been interrupted
     if (takeoff_state.last_check_ms && (now - takeoff_state.last_check_ms) > 200) {
-        gcs_send_text_fmt(MAV_SEVERITY_WARNING, "Timer interrupted AUTO");
 	    takeoff_state.launchTimerStarted = false;
 	    takeoff_state.last_tkoff_arm_time = 0;
         takeoff_state.last_check_ms = now;