Fix/compute_neighbors, issue #1212

[Abelgurung]

#1212
scv.pp.moments(adata, n_pcs= int , n_neighbors= int )

Returns:
TypeError: Neighbors.compute_neighbors() got an unexpected keyword argument 'write_knn_indices'

The argument write_knn_indices was deprecated in a previous commit (see scanpy commit 1fd6c46)

Removing 'write_knn_indices' arg from the compute_neighbors method call within scv.pp.moments does not seem to affect downstream analysis
Lmk what you think @WeilerP

[WeilerP]

Thanks, @Abelgurung. I'm closing this PR in favor of #1233. Please use the provided template and check unit tests locally when submitting a PR next time.