Copter: enable precision landing by default

ArduCopter/APM_Config.h

@@ -35,10 +35,10 @@
 //#define OPTFLOW               DISABLED            // disable optical flow sensor to save 5K of flash space
 //#define FRSKY_TELEM_ENABLED   DISABLED            // disable FRSky telemetry
 //#define ADSB_ENABLED          DISABLED            // disable ADSB support
+//#define PRECISION_LANDING     DISABLED            // disable precision landing using companion computer or IRLock sensor
 
 // features below are disabled by default on all boards
 //#define SPRAYER               ENABLED             // enable the crop sprayer feature (two ESC controlled pumps the speed of which depends upon the vehicle's horizontal velocity)
-//#define PRECISION_LANDING     ENABLED             // enable precision landing using companion computer or IRLock sensor
 //#define GNDEFFECT_COMPENSATION ENABLED            // enable ground effect compensation for barometer (if propwash interferes with the barometer on the ground)
 //#define CAL_ALWAYS_REBOOT                         // flight controller will reboot after compass or accelerometer calibration completes
 //#define DISALLOW_GCS_MODE_CHANGE_DURING_RC_FAILSAFE   // disable mode changes from GCS during Radio failsafes.  Avoids a race condition for vehicle like Solo in which the RC and telemetry travel along the same link

ArduCopter/config.h

@@ -307,7 +307,7 @@
 //////////////////////////////////////////////////////////////////////////////
 // Precision Landing with companion computer or IRLock sensor
 #ifndef PRECISION_LANDING
- # define PRECISION_LANDING DISABLED
+ # define PRECISION_LANDING ENABLED
 #endif
 
 //////////////////////////////////////////////////////////////////////////////