add call of `ActionController::Parameters#to_unsafe_h`
add call of `ActionController::Parameters#to_unsafe_h`

In https://github.com/rails/rails/commit/14a3bd520dd4bbf1247fd3e0071b59c02c115ce0,
ActionController::Parameters not inherited from Hash.

Therefore, to get all of the parameter, must call the `ActionController::Parameters#to_unsafe_h`.

josevalim/rails-footnotes,josevalim/rails-footnotes,josevalim/rails-footnotes