Calendars added after initial setup don't show up

[AutoImport-ghost]

Tested in combination with owncloud:

1. Setup davdroid
2. Add a new calendar in owncloud
3. Do a force sync in android/davdroid

Expected: The calendar shows up in the “calendars to sync” window in the android calendar; but it does not.

[rfc2822]

Calendars have to be selected in the setup window of DAVdroid, see FAQ “How can I change the URL/user name/password of my DAV resource or add a new calendar?”.