multi.c: add iroutes after dco peer is added

multi.c: add iroutes after dco peer is added

This doesn't matter for Linux and FreeBSD but matters
for dco-win, where iroute subnet is mapped to a peer
context, which means that peer has to be created before
iroute is added.

Change-Id: I1cac0f036504c87205a3c97589a94a662cf79b99
Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20250201121102.27395-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg30780.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>