backend/drm: Don't drop mode and crtc id
otherwise we can't blank/unblank on the devkit. Upstream bugreport: https://github.com/swaywm/wlroots/issues/1889
Edited by Guido Gunther
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otherwise we can't blank/unblank on the devkit. Upstream bugreport: https://github.com/swaywm/wlroots/issues/1889