If you uninstall zarafa and smeserver-zarafa (and
the other rpms installed with Zarafa) then the db settings won't matter any more.
If you're just trying to disable zarafa, simply re-run the db commands you ran to enable users, replacing 'enabled' with 'disabled'.
If you're trying to remove the db settings (because you've uninstalled zarafa and the unused db entries offend you) you'd use something like 'config delete zarafa-server' for the global entry, or 'db accounts delprop $USERNAME zarafa', repeating the command for each value of '$USERNAME' you used when installing zarafa (that is - 'db accounts delprop mjones zarafa' for user 'mjones', assuming that you had enabled zarafa for 'mjones' at some point in the past).
You can get a list of users with zarafa enabled using
db accounts print |grep -i zarafa