Fix issue when CMD+H doesn't hide the editor on MacOS

[AGulev]

Fixed issue when CMD+Hon MacOS shows Java About window instead of application hiding.

Fix #7528

PR checklist

• Code
  • Add engine and/or editor unit tests.
  • New and changed code follows the overall code style of existing code
  • Add comments where needed
• Documentation
  • Make sure that API documentation is updated in code comments
  • Make sure that manuals are updated (in github.com/defold/doc)
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[AGulev]

This old hack doesn't work anymore, but using of Desktop.getDesktop().setAboutHandler(null); helps and CMD+H works fine