newdevicemodel: set the whole config to avoid account deletion

When LRC call setAccountDetails without all config, this can leads
to the deletion of the account. Avoid this by giving the whole
config

Change-Id: Ida7f4c62bf23895ab33d3096c320c2561a52a620
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>