default provider is only saved if you login
the DefaultProvider entry in leap.conf should be updated whenever you select a different provider in the provider selection combobox.
currently, it is only updated after you have logged in.
this can create unexpected behavior:
(1) login to provider X (2) logout (3) connect VPN to provider Y (4) quit and restart
It will start back up with provider X, even though you quit with provider Y connected.
(from redmine: created on 2014-08-19, closed on 2014-08-20, relates #5997 (closed))