[Symfony 7] Drop unneeded argument to `HttpKernel`

Looks like the original deprecation of the bool $catchThrowable (https://github.com/symfony/symfony/pull/45997/files#diff-8a470a718608567...) went away in https://github.com/symfony/symfony/commit/8604d3ae048b5383f878db93a834c0....
and it became bool $handleAllThrowables = false https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/HttpKe....

So I think we can close this one as outdated, we still want to opt-in to that behaviour as we currently are, so there's nothing to remove AFAICT.