chan_sip: voice frames are no longer transmitted after emitting a COLP

The SIP transaction state was reset when emitting an UPDATE or a re-INVITE
related to a COLP, preventing RTP packets to be emitted.

ASTERISK-28647

Change-Id: Ie7a30fa7a97f711e7ba6cc17f221a0993d48bd8b

channels/chan_sip.c

@@ -15756,7 +15756,6 @@ static void update_connectedline(struct sip_pvt *p, const void *data, size_t dat
 			initialize_initreq(p, &req);
 			p->lastinvite = p->ocseq;
 			ast_set_flag(&p->flags[0], SIP_OUTGOING);
-			p->invitestate = INV_CALLING;
 			send_request(p, &req, XMIT_CRITICAL, p->ocseq);
 		} else if ((is_method_allowed(&p->allowed_methods, SIP_UPDATE)) && (!ast_strlen_zero(p->okcontacturi))) {
 			reqprep(&req, p, SIP_UPDATE, 0, 1);