Fixed no-op ifndef for ergodox ez (#3189)

Author: alexmalott

keyboards/ergodox_ez/ergodox_ez.h

@@ -33,7 +33,7 @@ uint8_t ergodox_left_leds_update(void);
 #ifndef LED_BRIGHTNESS_LO
 #define LED_BRIGHTNESS_LO       15
 #endif
-#ifndef LED_BRIGHTNESS_LO
+#ifndef LED_BRIGHTNESS_HI
 #define LED_BRIGHTNESS_HI       255
 #endif