bhottu thinks it is still in a channel after it has been told to join it and is kicked

[codyharrington]

Steps to reproduce:

1. Enable the 'channels' module with bhottu, enable channels
2. Tell bhottu to join a channel with bhottu, join #channel
3. Kick bhottu from the channel
4. Tell bhottu to join the channel again with bhottu, join #channel

Bhottu will think it is still in the channel because it joined it and was kicked, but doesn't remove the channel from the joined channels list if it is kicked.