pfsync: Fix state sync during initial bulk update

States learned via pfsync from a peer with the same ruleset checksum were not
getting assigned to rules like they should because pfsync_in_upd() wasn't
passing the PFSYNC_SI_CKSUM flag along to pfsync_state_import.

PR:		229092
Submitted by:	Kajetan Staszkiewicz <vegeta tuxpowered.net>
Obtained from:	OpenBSD
MFC after:	1 week
Sponsored by:	InnoGames GmbH

sys/netpfil/pf/if_pfsync.c

@@ -869,7 +869,7 @@ pfsync_in_upd(struct pfsync_pkt *pkt, struct mbuf *m, int offset, int count)
 		st = pf_find_state_byid(sp->id, sp->creatorid);
 		if (st == NULL) {
 			/* insert the update */
-			if (pfsync_state_import(sp, 0))
+			if (pfsync_state_import(sp, pkt->flags))
 				V_pfsyncstats.pfsyncs_badstate++;
 			continue;
 		}