Fix a compile error

`max_layers` is a method, so comparing to that would be integer<->pointer
comparison. We want to compare to `max_layers_`.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/Kaleidoscope/EEPROM-Keymap.cpp

@@ -60,7 +60,7 @@ Key EEPROMKeymap::getKeyOverride(uint8_t layer, byte row, byte col) {
   * the layer count in PROGMEM (layer_count). If we are, read from PROGMEM,
   * otherwise leave the key as-is (either transparent or NoKey).
   */
-  if ((key == Key_Transparent || layer >= max_layers) &&
+  if ((key == Key_Transparent || layer >= max_layers_) &&
       (layer < layer_count))
     key = Layer.getKeyFromPROGMEM(layer, row, col);