saned: catch SIGINT,SIGTERM in foreground listener

These signals were only being caught when daemonised but should also be
handled with the non-daemonised standalone server otherwise child
processes like the Avahi service can remain after the main process
is terminated.

frontend/saned.c

@@ -3264,10 +3264,10 @@ run_standalone (char *user)
       close (fd);
 
       setsid ();
+    }
 
   signal(SIGINT, sig_int_term_handler);
   signal(SIGTERM, sig_int_term_handler);
-    }
 
   if (user)
     runas_user(user);