Web IDL validation errors

[autokagami]

🤖 This is an automatic issue report for Web IDL validation error. 🤖

The bot found validation errors but couldn't fix them automatically, since there is no proper autofix for them. Please check the following messages and fix them.

• Validation error at line 4 in ink-enhancement,0, inside `interface Ink -> operation requestPresenter -> argument param`:
          optional InkPresenterParam? param = null);
                                      ^
  

  Error: Dictionary arguments cannot be nullable.

Please file an issue at https://github.com/saschanaz/webidl-updater/issues/new if you think this is invalid or should be enhanced.