feat: allow XWayland window to start minimized

[RipleyTom]

This is part of a fix for XCOM2 not starting in fullscreen.

This adds support for XWayland windows to map minimized.
This needs the companion PR Smithay/smithay#2113 to be merged.

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[RipleyTom]

Tried to push a commit to update smithay but there seems to be some breakage in dependency chains so reverted for now.
Just noting that this PR does nothing without the smithay update.

[RipleyTom]

This can potentially be merged now that Smithay has been updated).
@Drakulix

[Drakulix]

Thx. Looks good to me! :)