m_remove has wrong syntax for /remove command

[HelixSpiral]

When it was written whoever wrote it did the channel/nick parameters wrong, since then a second command fpart has been added with the correct syntax.

However, for clients that are implementing /remove this breaks on any inspircd network due to it being wrong.

I think the syntax for /remove should be fixed to work the correct way. The amount of disruption caused by this should not be overly huge.

Example of a client that's not going to work with inspircds implementation: weechat/weechat#91
Exact line: weechat/weechat@34098ce#diff-dacbf32b195ec9426d1d0bae88776811R4093

[attilamolnar]

Fixed, we can remove /FPART or turn it into an alias after 2.2 when 2.0 compatibility is dropped.