Make the MAGIC_TOGGLE_GUI keycode work (#14886)

quantum/process_keycode/process_magic.c

@@ -43,6 +43,7 @@ bool process_magic(uint16_t keycode, keyrecord_t *record) {
         switch (keycode) {
             case MAGIC_SWAP_CONTROL_CAPSLOCK ... MAGIC_TOGGLE_ALT_GUI:
             case MAGIC_SWAP_LCTL_LGUI ... MAGIC_EE_HANDS_RIGHT:
+            case MAGIC_TOGGLE_GUI:
                 /* keymap config */
                 keymap_config.raw = eeconfig_read_keymap();
                 switch (keycode) {