Fix onekey console keymap (#13797)

keyboards/handwired/onekey/keymaps/console/keymap.c

@@ -12,7 +12,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
     switch (keycode) {
         case KC_HELLO:
             if (record->event.pressed) {
-                printf("Hello world!\n");
+                println("Hello world!");
             }
             return false;
     }