Result count only reflects the distinct count

[bruth]

The resource that computes the result count has changed in the Serrano API, but never got updated in Cilantro. This change https://github.com/chop-dbhi/serrano/commit/ce4ba2ae22b85ed901ff4449f0a63bd536bc0039 removed the result count from the preview endpoint. The new endpoint is at /api/queries/session/stats/ and will return the distinct and result counts.