Claws Mail 3.9.3 doesn't support dotted lines anymore.

As I learned today, claws-mail in the current version doesn't support the dotted line feature anymore. I commented out everything referring to this (old) features. Dunno if it is the way to go, because old versions running could still support these options.

Checked if it builds, it does.

Thanks for the work so far on clawsker!

koeart