rubocop: Set `inherit_mode` for allowed `Naming/MethodParameterName`
rubocop: Set `inherit_mode` for allowed `Naming/MethodParameterName`

- As I was looking through the RuboCop configs for
  `Naming/MethodParameterName`, since there was a fairly long-standing
  TODO here, I found that in the default RuboCop configs the method
  names `to` and `io` are
  [allowed by default](https://github.com/rubocop/rubocop/blob/41a8249b3595cc8656b823d50b2abe38206fd09a/config/default.yml#L2794).
- But we weren't inheriting those allowed names correctly from the
  default configuration. This fixes that so that we get future
  enhancements automatically for this particular cop allowlist.

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