Nickname defaults to system's username not IRC username

"username" alone is ambiguous and without jumping to ENVIRONMENT
explaining the use of USER, catgirl's user- and nickname options read
like pointing at each other:

-n nick | nick = nick
        Set nickname to nick.  The default nickname is the user's name.
[...]
-u user | user = user
        Set username to user.  The default username is the same as the
        nickname.

Clarify that `-n' does *not* default to `-u's value.

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