Fix (open api writer): Allow to use same parameter name in different scopes

[StanisLove]

I faced with a problem that I can't use the same parameter name in different scopes.
For example

parameter :name, 'Player 1 name', scope: [:data, :player1]
parameter :name, 'Player 2 name', scope: [:data, :player2]

gives you only the first parameter in the result open api json.

This PR fixes this issue.