Fix for spawning scripts that require no args

For example, "ddspawn vifm" is generating the failing commad "st vifm -e vifm" without this fix.
This proposed change fixes this issue so that "ddspawn vifm" generates the correct "st -e vifm". It also simplify  the i3 command in my view.
Thanks for sharing this helpful script, I used it everywhere!

.scripts/i3cmds/ddspawn

@@ -13,5 +13,5 @@ then
 	i3 "[instance=\"dropdown_$1\"] scratchpad show; [instance=\"dropdown_$1\"] move position center"
 else
 	echo "Window not detected... spawning."
-	i3 "exec --no-startup-id $TERMINAL -n dropdown_$1 $(echo "$@" | cut -d ' ' -f2-) -e $1"
+	i3 "exec --no-startup-id $TERMINAL -n dropdown_$1 ${@:2} -e $1"
 fi