daemon: Hook up external-brightness-v1 "set_uses_ddc_ci"
Companion MR for libraries/plasma-wayland-protocols!98 (merged) and related MRs linked from there.
Requires updates to libkscreen and plasma-wayland-protocols.
This will tell the compositor that a DDCutilDisplay
is using DDC/CI.
As a result, KWin can decide to ignore it or otherwise treat it
differently than other brightness devices which may be considered
more reliable or responsive.