lock instead of logout

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

home/system/caelestia-shell/launcher.nix

@@ -1,8 +1,8 @@
 {
   programs.caelestia.settings = {
     session.commands = {
-      logout = ["loginctl" "terminate-user" ""];
       shutdown = ["systemctl" "poweroff"];
+      logout = ["loginctl" "lock-session"];
       hibernate = ["systemctl" "hibernate"];
       reboot = ["systemctl" "reboot"];
     };