UnderscoreParameters plug underscore filters only in params map and not in jsonapi_query assign.

[CostantiniMatteo]

Hi, I've noticed that using UnderscoreParameters acts inconsistently with filters. For example, the following request:

http://localhost/api/comments?filter[userId]=123

corresponds, in the controller, to the following params:

%{"filters" => %{"user_id" => 123}}

which is the expected behaviour.

However, the filter keyword list in jsonapi_query contains the non-underscored version of the parameters:

%{filter: [userId: 123]}

I would like to know if this is the expected behaviour or not, and whether a PR to consistently underscore filters is welcome.

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