MINOR: stream-int: Remove SI_FL_NOLINGER/NOHALF to rely on CS flags instead

Flags to disable lingering and half-close are now handled at the conn-stream
level. Thus SI_FL_NOLINGER and SI_FL_NOHALF stream-int flags are replaced by
CS_FL_NOLINGER and CS_FL_NOHALF conn-stream flags.
diff --git a/src/peers.c b/src/peers.c
index 4d86126..7c40e45 100644
--- a/src/peers.c
+++ b/src/peers.c
@@ -3210,7 +3210,7 @@
 
 	/* initiate an outgoing connection */
 	s->csb->dst = addr;
-	cs_si(s->csb)->flags |= SI_FL_NOLINGER;
+	s->csb->flags |= CS_FL_NOLINGER;
 	s->flags = SF_ASSIGNED|SF_ADDR_SET;
 	s->target = peer_session_target(peer, s);