odhcp6c: fix IA discard when T1 > 0 and T2 = 0
My ISP uses DHCPv6 advertisements where IA_PD T1 is non-zero (43200) and
T2 is zero. Current implementation of odhcp6c doesn't handle that and
just switches to stateless mode.
According to RFC 8415, section [21.21](https://datatracker.ietf.org/doc/html/rfc8415#section-21.21):
> If a client receives an IA_PD with T1 greater than T2 and both T1 and
T2 are greater than 0, the client discards the IA_PD option and
processes the remainder of the message as though the server had not
included the IA_PD option.
Currently odhcp6c discards IA_PD option if `t1 > t2`:
https://github.com/openwrt/odhcp6c/blob/
39b584bcac8770619b545d6ae344758f87028612/src/dhcpv6.c#L1346-L1347
The same applies for IA_NA.
Fix it by editing IA discard condition according to RFC.
Signed-off-by: Dávid Benko <davidbenko@davidbenko.dev>