fix micro ocdav service

[butonic]

We no longer call Init to configure default options because it was replacing the existing options.

[kobergj]

Nice 👍

[phil-davis]

Is this fix related to owncloud/ocis#9659 ?
(where test pipelines had a problem related to ocdav)

[kobergj]

Yes. This should fix all pipelines that failed with

{
  "level": "error",
  "service": "com.owncloud.web.ocdav",
  "error": "not found",
  "time": "2024-07-22T00:51:06Z",
  "message": "could not select service from the registry"
}

(presumably)