Plane: enable MAV_CMD_DO_DIGICAM_CONTROL

ArduPlane/commands_logic.pde

@@ -114,6 +114,7 @@ static void handle_process_do_command()
         break;
 
     case MAV_CMD_DO_DIGICAM_CONTROL:                    // Mission command to control an on-board camera controller system. |Session control e.g. show/hide lens| Zoom's absolute position| Zooming step value to offset zoom from the current position| Focus Locking, Unlocking or Re-locking| Shooting Command| Command Identity| Empty|
+        camera.trigger_pic();
         break;
 #endif