Remove edge splitter progress update prints

[kjun9]

This removes progress update printing (every 1000 edges removed) for edge splitter.

Notebooks using edge splitter:

./ensembles/ensemble-link-prediction-example.ipynb
./link-prediction/node2vec-link-prediction.ipynb
./link-prediction/gcn-link-prediction.ipynb
./link-prediction/graphsage-link-prediction.ipynb
./embeddings/graphsage-unsupervised-sampler-embeddings.ipynb
./calibration/calibration-link-prediction.ipynb

Everything except the calibration one uses the Cora dataset which doesn't have enough edges to be printing any progress updates from the edge splitter, so just need to rerun the calibration notebook.

See #1454

[codeclimate]

Code Climate has analyzed commit 8cb60d4 and detected 4 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	2
Duplication	2

View more on Code Climate.

[timpitman]

looks good 👍