Fix warn() output for MachineUI
Fix warn() output for MachineUI

We used "self" but the paramter was called "s". Fixes a crash when we
ui.warn() (only when using the MachineUI).

Signed-off-by: Sebastian Spaeth <98dcb2717ddae152d5b359c6ea97e4fe34a29d4c@SSpaeth.de>

frioux/offlineimap,frioux/offlineimap