Private flag for lastfm

[acepilot1023]

Basically allow a user to set a private flag (similar to the dontsave flag) when using last.fm where the bot doesn't show the lastfm username (it's already prefixed with the client's nickname).

It would trigger if 'user' was shown in the output or not:

105. out = '{} {} "{}"'.format(user, status, title)