Update scripts to check if using wayland or x11

- game launch/exit script's picom disable/enable
  and xfce power manager presentation mode only
  apply when running dwm
- GPU profile switching with nvidia-settings only
  works when running x11

gaming/.scripts/game_exit.sh

@@ -1,6 +1,9 @@
 #!/usr/bin/env bash
-/home/sravan/.scripts/picom.sh --on &
+if [ $XDG_SESSION_DESKTOP == "dwm" ]; then
+    /home/sravan/.scripts/picom.sh --on &
+    /usr/bin/xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode -s false &
+fi
+
 /home/sravan/.scripts/dunst.sh --unpause &
 /home/sravan/.scripts/cpu-gpu.sh --cpu-profile-balanced &
 /home/sravan/.scripts/cpu-gpu.sh --gpu-profile-adaptive &
-/usr/bin/xfconf-query -c xfce4-power-manager -p /xfce4-power-manager/presentation-mode -s false &