d/vive: Use undef instead of comment for debug define [NFC]

src/xrt/drivers/vive/vive_controller.c

@@ -102,6 +102,9 @@ enum vive_controller_input_index
 #define DEFAULT_HAPTIC_FREQ 150.0f
 #define MIN_HAPTIC_DURATION 0.05f
 
+// Debug define(s), always off.
+#undef WATCHMAN2_PRINT_HID
+
 
 /*
  *
@@ -744,8 +747,6 @@ vive_controller_decode_watchmanv1(struct vive_controller_device *d, struct vive_
 		vive_controller_handle_lighthousev1(d, buf, end - buf);
 }
 
-//#define WATCHMAN2_PRINT_HID
-
 /*
  * Handles battery, imu, trigger, buttons, trackpad.
  * Then hands off to vive_controller_handle_lighthousev1().