Sub: remove heading hold debug message from stabilize

ArduSub/control_stabilize.cpp

@@ -3,7 +3,6 @@
 #include "Sub.h"
 
 namespace {
-	static uint32_t last_stabilize_message_ms = 0;
 	uint32_t last_pilot_heading;
 	uint32_t last_pilot_yaw_input_ms = 0;
 }
@@ -65,11 +64,6 @@ void Sub::stabilize_run()
 
 	} else { // hold current heading
 
-		if(tnow > last_stabilize_message_ms + 1500) {
-			gcs_send_text_fmt(MAV_SEVERITY_INFO, "target: %d", last_pilot_heading);
-			last_stabilize_message_ms = tnow;
-		}
-
 		// this check is required to prevent bounce back after very fast yaw maneuvers
 		// the inertia of the vehicle causes the heading to move slightly past the point when pilot input actually stopped
 		if(tnow < last_pilot_yaw_input_ms + 250) { // give 250ms to slow down, then set target heading