bugfix: walk on parameter references

[tomleb]

Fixes #539

The walker doesn't walk on parameter references (#/parameters/) which may contain definition references (#/definitions/) that we want to keep.

This happens often with DeleteOptions and the DeleteOptions definition ends up being filtered out when looking at a OpenAPI V2 document.

[linux-foundation-easycla]

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• ✅ login: tomleb / name: Tom Lebreux (4e3a38d)

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