Akonadi calls writeConfig DBus method to save the configuration for newly
created resources, both via firstrun and SpecialCollections mechanisms.
This method is non-existent for all of the resources (it was deprecated in
KConfig, and apparently is not exported to DBus), method save should
be used instead.
This is related to issues raised in D27905: [resources/maildir] Reload configuraton on configuration change: settings provided in firstrun did
not override default settings for the resource.
CCBUG: 345211
CCBUG: 352502