screencopy: wait longer to re-enable DS

[njdom24]

Describe your PR, what does it fix/add?

When screen-recording, DS constantly enables/disables between frames if the capture framerate is lower than the render framerate, causing frequent stutter (games) and modesets (VLC, non-shader CM). This change gives it some headroom before re-enabling DS.

Is there anything you want to mention? (unchecked code, possible bugs, found problems, breaking compatibility, etc.)

Tested with games/VLC and capturing with gpu-screen-recorder w/ pipewire capture, and OBS.

Is it ready for merging, or does it need work?

Ready

[s0mebodyhelpme]

Idk what happened but applying these PRs (including this one) fixed the HDR screenshare being overly bright and having inaccurate colors for me.:
#12094
#12052
#12127
#12133
#12135

Only issue left is I can't adjust brightness or saturation anymore with sdrsaturation and sdrbrightness or with any of the luminance settings.

Note: I also updated my system recently but I doubt that's what caused it.

Edit: Nvm HDR games like Marvel's Spider-Man 2 still look overly bright. Indiana Jones works fine though.

[njdom24]

@s0mebodyhelpme Thanks for testing! #12094 would be the big one for the results you described. I'll have to give it another look to see why the SDR settings broke. I used sdr_max_luminance and it adjusted as expected, but I didn't test them all.

As for the screenshare brightness, I have some WIP changes locally to improve that, but I'd like to stop spamming changes and get the more significant stuff reviewed first.