MINOR: listener: move the INHERITED flag down to the receiver

It's the receiver's FD that's inherited from the parent process, not
the listener's so the flag must move to the receiver so that appropriate
actions can be taken.
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index 4378db3..5cabea2 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -270,7 +270,7 @@
 	          thread_mask(listener->rx.settings->bind_thread) & all_threads_mask);
 
 	/* for now, all regularly bound UNIX listeners are exportable */
-	if (!(listener->options & LI_O_INHERITED))
+	if (!(listener->rx.flags & RX_F_INHERITED))
 		fdtab[fd].exported = 1;
 
 	return err;