Fix Mathoid integration test

A recent change in mathoid, i.e. 
I8d3cec0ee8a8c9368b7dca89e1d5e0c5683f946c 
removed the margins. This causes breaking unit tests.

Change-Id: I312d6226c6f24c84254b99ee6292564a421133c3
Merge "Fix Mathoid integration test"