fix compile

Author: veypatch

users/veypatch/display/display.c

@@ -35,10 +35,14 @@ painter_device_t lcd_surface;
 
 led_t last_led_usb_state = {0};
 layer_state_t last_layer_state = {0};
+
 #if defined(OS_DETECTION_ENABLE)
 os_variant_t last_os = {0};
 #endif // OS_DETECTION_ENABLE
+
+#ifdef SWAP_HANDS_ENABLE
 static bool last_swap_state = false;
+#endif // SWAP_HANDS_ENABLE
 
 static uint16_t lcd_surface_fb[135*240];