Revert "Enable Vsync via Compositor by default"

[akien-mga]

This reverts commit 9600fd5.

Add comment warning about possible implications of using this option.

Fixes #35038.

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Note: The added warning could be removed once further work is done on the feature to prevent halving the framerate. It sounds like for those users, the option somehow behaves as if Vsync happens twice as much?

[hoontee]

Developers who are affected by the stuttering will enable vsync_via_compositor and inadvertently halve the framerate of a portion of its playerbase. The issue may need to be fixed before 3.2's release.

[Calinou]

@hoontee As a workaround, there are command line arguments to forcibly disable/enable this feature regardless of the current project setting:

--enable-vsync-via-compositor
--disable-vsync-via-compositor

[hoontee]

@Calinou Some games may naturally be locked to 30 FPS, so players might not know that there's a problem; if they do, how would they know how to fix it?

[Calinou]

@hoontee I was only proposing a workaround. We don't know if we'll be able to fix the issue before 3.2 is released. It'd be unfortunate to remove the feature entirely, asmany people have reported success using it.

Besides, games limited to 30 FPS on desktop platforms are very uncommon nowadays.