quotes plugin: 'other channel' commands must be mapped earlier

quotes plugin: 'other channel' commands must be mapped earlier

Due to the way mapping work, quote commands whose first parameter is a
channel must be mapped before the ones that implicitly refer to the
current channel.

This has the upside that they really work, and the downside that
commands that refer to the current channel must specify the channel if
their argument begins wit something that looks like a channel spec.
However, this last case is extremely rare, so we're fine.