Use step model for OpenId server settings deploy

[kaipm]

This is another part of #6364

The deployment source currently exports OpenIdServerSettings directly, whereas the recipe step parses OpenIdServerSettingsStepModel.

Most properties work fine anyway, but the endpoint settings are ignored by the recipe step.

Example of previous export (ignored by recipe import):

...
"AuthorizationEndpointPath": "/connect/authorize",
"LogoutEndpointPath": "/connect/logout",
"TokenEndpointPath": "/connect/token",
"UserinfoEndpointPath": null,
...

Example of fixed export:

...
"EnableTokenEndpoint": true,
"EnableAuthorizationEndpoint": true,
"EnableLogoutEndpoint": true,
"EnableUserInfoEndpoint": false,
...

The endpoint paths are no longer exported at all, because the recipe step only reads the boolean values, and uses constants for the paths if a flag is true.

The UI does not allow to edit the endpoint paths either, so I'm hoping this fix is fine.