cgminer: respect xserver.display variable

Changed files
+1 -1
nixos
modules
services
+1 -1
nixos/modules/services/misc/cgminer.nix
···
environment = {
LD_LIBRARY_PATH = ''/run/opengl-driver/lib:/run/opengl-driver-32/lib'';
-
DISPLAY = ":0";
+
DISPLAY = ":${toString config.services.xserver.display}";
GPU_MAX_ALLOC_PERCENT = "100";
GPU_USE_SYNC_OBJECTS = "1";
};