datastore: delete stray blank line
datastore: delete stray blank line

Change-Id: I3f52eff266e0a6fd939fd6348dd0251e5dda11cd
Reviewed-on: https://code-review.googlesource.com/4700
Reviewed-by: David Symonds <7f6bb564ed9e580d4f0aa90d53b34578e5d24cb9@golang.org>

michael-grosshans/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,michael-grosshans/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go