DEV: When adding a new filter to a provider, the modifiedDate does not update when the new version is created.

When adding a new filter to a provider, the 'modifiedDate' property should be updated as if the provider had been edited. Currently it does not get updated.

POST: /MetadataResolvers/{resolverId}/Filters

GET Version: /MetadataResolvers/{resolverId}/Versions/{versionId}