Rover: report unhealthy compass if primary compass unhealthy

APMrover2/GCS_Mavlink.pde

@@ -155,7 +155,7 @@ static NOINLINE void send_extended_status1(mavlink_channel_t chan)
 
     // default to all healthy except compass and gps which we set individually
     control_sensors_health = control_sensors_present & (~MAV_SYS_STATUS_SENSOR_3D_MAG & ~MAV_SYS_STATUS_SENSOR_GPS);
-    if (g.compass_enabled && compass.healthy() && ahrs.use_compass()) {
+    if (g.compass_enabled && compass.healthy(0) && ahrs.use_compass()) {
         control_sensors_health |= MAV_SYS_STATUS_SENSOR_3D_MAG;
     }
     if (g_gps != NULL && g_gps->status() >= GPS::GPS_OK_FIX_3D) {