Corrected values for test_get_ontology.

[knirirr]

This fixes the get_ontology test where the values returned have diverged from what's in the test.
I was looking at #557 initially but could not reproduce that issue.

[proccaserra]

@knirirr closing as the issue has been addressed in issue-511 PR with:

self.assertIn("https://www.ebi.ac.uk/ols", ontology_source.file)
self.assertIn("/api/ontologies/efo?lang=en", ontology_source.file)

to cope with version change (assuming it follows a pattern)