check SXMO_WM instead of tinydm session when logging out

This could break if someone decides not to use tinydm, or uses
tinyd-set-session instead of togglewm.

Signed-off-by: Anjandev Momi <anjan@momi.ca>

scripts/core/sxmo_power.sh

@@ -22,13 +22,9 @@ case "$1" in
 		;;
 	logout)
 		sxmo_hook_logout.sh
-		case "$(realpath /var/lib/tinydm/default-session.desktop)" in
-			*"swmo.desktop")
-				swaymsg exit
-				;;
-			*"sxmo.desktop")
-				pkill dwm
-				;;
+		case "$SXMO_WM" in
+			"sway") swaymsg exit ;;
+			"dwm") pkill dwm ;;
 		esac
 		;;
 	togglewm)