[sr-dev] [kamailio/kamailio] CANCEL msg results in "500 cancel error" because of "duplicate From header" error (#2572)

[Justin LaVelle]

Thank you. I built from master, and can verify that this error no longer occurs on cancel with the "From-Person" header.

```
version: kamailio 5.5.0-dev3 (x86_64/linux) a2eff9
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: a2eff9
compiled on 22:09:44 Dec  5 2020 with gcc 8.3.0
```

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