The idl definition for Event makes the properties constant
this means that they shouldn't be configurable and writable.
However, they were, and this commit fixes that.
Fixes: https://github.com/nodejs/node/issues/50417
PR-URL: https://github.com/nodejs/node/pull/50425
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Matthew Aitken <maitken033380023@gmail.com>
