send_linebuf_remote(): Remove broken and useless ghost check that can never happen.

send_linebuf_remote(): Remove broken and useless ghost check that can never happen.

Reasoning why it never does anything:
- the to = to->from line makes sure that MyConnect(to)
- then IsPerson(to) && (to == from->from) implies that to == from
- so MyClient(to)
- which cannot happen because it also wants that !MyClient(from)

Originally, the to = to->from line was below, and it did a
fake direction check, killing a client if servers could be
confused about it. The kill cannot do any good with TS6.

The fake direction check is and was performed by the
callers of send_linebuf_remote().