[Game Relations] Support for full-screen

[Gamer1478x]

Pre-Request Checklist

• I have checked and confirmed this is not a duplicate issue
• I have verified that I'm using the latest version of the extension by checking for updates in Playnite
• I have modified the placeholder issue title according to this issue

Extension name

Game Relations

Feature Description

Support for full-screen

Screenshots or Mockups

No response