[mathml-tests] Remove gratuitous metadata and self-loop in reftest graph (#4215)

Ideally, we'd have a lint for this. Possibly actually walking the graph, as a first step towards doing more complex graph-based lints.

View on GitHub: https://github.com/w3c/web-platform-tests/pull/4215

Received on Tuesday, 15 November 2016 21:54:29 UTC