Shared parameters are not inherited

[dim]

In relation to #2113

[grape-bot]

	1 Warning
⚠️	Unless you’re refactoring existing code, please update CHANGELOG.md.

	1 Message
📖	We really appreciate pull requests that demonstrate issues, even without a fix. That said, the next step is to try and fix the failing tests!

Here's an example of a CHANGELOG.md entry:

* [#2114](https://github.com/ruby-grape/grape/pull/2114): Shared parameters are not inherited - [@dim](https://github.com/dim).

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