Move omarchy-lock-screen to omarchy-system-lock to fit with the others

bin/omarchy-menu

@@ -600,7 +600,7 @@ show_system_menu() {
 
   case $(menu "System" "$options") in
   *Screensaver*) omarchy-launch-screensaver force ;;
-  *Lock*) omarchy-lock-screen ;;
+  *Lock*) omarchy-system-lock ;;
   *Suspend*) systemctl suspend ;;
   *Hibernate*) systemctl hibernate ;;
   *Logout*) omarchy-system-logout ;;