enable new accounts

[butonic]

When new accounts are created, they also need to be enabled to be useable. Otherwise we might see sth like this in the logs when a new user tries to log in:

2020-07-27T15:27:29Z DBG unmarshalled userinfo claims={"email":"user1@example.org","family_name":"User One","given_name":"user1","iss":"","name":"User One","preferred_username":"user1","sub":"guyRptzBUh7Hoa_89QQteYhQ6Z_cpUBJf3lLYnsxgeYw7TNI9DgeaKXSVaYHGi9_V3820mP-V5kz7CLIECV64w@konnect"} service=proxy userInfo={"email":"user1@example.org","email_verified":false,"profile":"","sub":"guyRptzBUh7Hoa_89QQteYhQ6Z_cpUBJf3lLYnsxgeYw7TNI9DgeaKXSVaYHGi9_V3820mP-V5kz7CLIECV64w@konnect"} | 3001s
-- | --
18503 | 2020-07-27T15:27:29Z DBG using cache entry for mail eq 'user1@example.org' service=proxy | 3001s
18504 | 2020-07-27T15:27:29Z DBG account is disabled account={"creationType":"LocalAccount","id":"189af58e-dd6c-4ae9-a099-9fd48cbafbe5","mail":"user1@example.org","onPremisesSamAccountName":"user1","preferredName":"user1"} service=proxy | 3001s
18505 | 2020-07-27T15:27:32Z DBG Refreshing external service-registration service={"endpoints":[],"metadata":null,"name":"com.owncloud.reva","nodes":[{"address":"0.0.0.0:9142","id":"com.owncloud.reva-1b810d26-baf9-4d4f-a26b-5dcce70bb30d","metadata":{"broker":"http","protocol":"grpc","registry":"mdns","server":"grpc","transport":"grpc"}}],"version":""}