RDP: Also disconnect the cliprdr channel
Missing code from !63 (merged) to also disconnect the channel.
https://github.com/FreeRDP/FreeRDP/blob/master/client/Sample/tf_channels.c#L71
Missing code from !63 (merged) to also disconnect the channel.
https://github.com/FreeRDP/FreeRDP/blob/master/client/Sample/tf_channels.c#L71