[Keymap] Redox_w Use layer_state_set_user instead of matrix_scan_user (#6608)

* use layer_state_set_user

* fix

keyboards/redox_w/keymaps/default/keymap.c

@@ -91,10 +91,8 @@ const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
 
 };
 
-void matrix_scan_user(void) {
-    uint8_t layer = biton32(layer_state);
-
-    switch (layer) {
+layer_state_t layer_state_set_user(layer_state_t state) {
+    switch (get_highest_layer(state)) {
         case _QWERTY:
             set_led_off;
             break;
@@ -110,6 +108,7 @@ void matrix_scan_user(void) {
         default:
             break;
     }
-};
+  return state;
+}