[UPDATE][SCRIPT] Handle switch_user in i3exit

Also switched from tabulation to spaces as indentation.

scripts/i3exit

@@ -18,6 +18,9 @@ case "$1" in
     logout)
         i3-msg exit
         ;;
+    switch_user)
+        dm-tool switch-to-greeter
+        ;;
     suspend)
         lock && systemctl suspend
         ;;
@@ -31,7 +34,7 @@ case "$1" in
         systemctl poweroff
         ;;
     *)
-        echo "Usage: $0 {lock|logout|suspend|hibernate|reboot|shutdown}"
+        echo "Usage: $0 {lock|logout|switch_user|suspend|hibernate|reboot|shutdown}"
         exit 2
 esac