Remove check for kwargs in snowplow spec helper with Ruby 2.7
With !44711 (merged) we fixed the **kwargs
check for expecting Snowplow events since it would otherwise provide an empty Hash {}
as an argument.
This gets fixed with Ruby 2.7 where Double splat with an empty hash (**{}) passes no arguments anymore, see: https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/
We therefore can revert the change made in !44711 (merged)
Edited by Nicolas Dular