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

@@ -3264,11 +3264,11 @@ run_standalone (char *user)
       close (fd);
 
       setsid ();
-
-      signal(SIGINT, sig_int_term_handler);
-      signal(SIGTERM, sig_int_term_handler);
     }
 
+  signal(SIGINT, sig_int_term_handler);
+  signal(SIGTERM, sig_int_term_handler);
+
   if (user)
     runas_user(user);