Plane: crash detection hard landing detection should skip debounce

closes https://github.com/ArduPilot/ardupilot/issues/7683

ArduPlane/is_flying.cpp

@@ -208,8 +208,8 @@ void Plane::crash_detection_update(void)
             if (!crash_state.checkedHardLanding && // only check once
                 been_auto_flying &&
                 (labs(ahrs.roll_sensor) > 6000 || labs(ahrs.pitch_sensor) > 6000)) {
+                
                 crashed = true;
-                crash_state.debounce_time_total_ms = CRASH_DETECTION_DELAY_MS;
 
                 // did we "crash" within 75m of the landing location? Probably just a hard landing
                 crashed_near_land_waypoint =
@@ -218,7 +218,8 @@ void Plane::crash_detection_update(void)
                 // trigger hard landing event right away, or never again. This inhibits a false hard landing
                 // event when, for example, a minute after a good landing you pick the plane up and
                 // this logic is still running and detects the plane is on its side as you carry it.
-                crash_state.debounce_timer_ms = now_ms + CRASH_DETECTION_DELAY_MS;
+                crash_state.debounce_timer_ms = now;
+                crash_state.debounce_time_total_ms = 0; // no debounce
             }
 
             crash_state.checkedHardLanding = true;