#11 Service 1C (CONFINVITE), members on key 53 (not 52)

[dnorgord]

In libyahoo2.c, service 0x1C
(YAHOO_SERVICE_CONFADDINVITE) I was not
getting the list of conference members from the library
API.

I observed that the list of members come in on key 53,
instead of on 52. So I switched keys 52 and 53 for this
one service in yahoo_process_conference().

I also occasionally observed duplicate member names.

I temporarily worked around the problem by making a
custom copy of yahoo_process_conference() for service
0x1C. This copy swaps the keys and filters out
duplicate names.