fix detection of screen dimensions

Signed-off-by: Stacy Harper <contact@stacyharper.net>

configs/default_hooks/lisgdstart

@@ -26,9 +26,9 @@ case "$(sxmo_wm.sh)" in
 		orientation="$((transform / 90))"
 		;;
 	dwm)
-		output="$(xrandr | grep DSI-1 | sed "s|.* \(\d\+\)x\(\d\+\)+.*|\1 \2|")"
+		output="$(xrandr | grep DSI-1 | cut -d' ' -f4)"
-		height="$(printf %s "$output" | cut -d" " -f2)"
+		height="$(printf %s "$output" | cut -d'x' -f2 | cut -d'+' -f1)"
-		width="$(printf %s "$output" | cut -d" " -f1)"
+		width="$(printf %s "$output" | cut -d'x' -f1)"
 		case "$(xrandr | grep DSI-1 | cut -d' ' -f 5)" in
 			right) orientation=1;;
 			left) orientation=3;;