Update vifon keymap to use `DYN_REC_STOP`

keyboards/planck/keymaps/vifon/keymap.c

@@ -107,7 +107,8 @@ const uint16_t PROGMEM fn_actions[] = {
 bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     static uint16_t key_timer;
 
-    if (!process_record_dynamic_macro(keycode, record)) {
+    uint16_t macro_kc = (keycode == MO(_DYN) ? DYN_REC_STOP : keycode);
+    if (!process_record_dynamic_macro(macro_kc, record)) {
         return false;
     }