Fixed false 415 responses for implicitly-bound route params (#1136)

* Fixed false 415 responses for implicitly-bound route params

* use final route for accepts metadata

* update openapi snapshots for route param tests

* micro optimizations

* Updated changelog

* compare against field name instead of prop name

* simplify changelog entry

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Co-authored-by: Sjors Goering <s.goering@4dotnet.nl>
Co-authored-by: Dĵ ΝιΓΞΗΛψΚ <dj-nitehawk@users.noreply.github.com>