Add a "remember this app for this filetype" checkbox
![screenshot](https://invent.kde.org/plasma/xdg-desktop-portal-kde/uploads/98f6666645e5b7fbf6b6924512e7b05d/image.png)
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![screenshot](https://invent.kde.org/plasma/xdg-desktop-portal-kde/uploads/98f6666645e5b7fbf6b6924512e7b05d/image.png)