[IRCServices Coding] Services 5.0 alpha 20 Small Bug with new channel auto mode merge

[Mark Hetherington]

Since the introduction of automatic merging of modes regardless of the merge
modes setting in the configuration, Chanserv will often produce the
following:

 *** ChanServ sets mode: +oa nickname nickname

Although this would be useful in a case of

 *** ChanServ sets mode: +oo nickname1 nickname2

for multiple modes on one user, it would be preferable to only display the
nickname once.

Mark.