[HttpKernel] Fix default value ignored with pinned resolvers

[HypeMC]

Q	A
Branch?	6.3
Bug fix?	yes
New feature?	no
Deprecations?	no
Tickets	-
License	MIT
Doc PR	-

Since #48992 the default value is ignored when, for example, #[MapEntity] is used:

#[Route('/')]
#[Route('/{someId}')]
public function index(#[MapEntity(id: 'someId')] ?Post $post): Response
{
    // ...
}

Before, $post would be null when making a request to /, now an exception is thrown:

Controller "App\Controller\TestController::index" requires that you provide a value for the "$post" argument.
Either the argument is nullable and no null value has been provided,
no default value has been provided or there is a non-optional argument after this one.

Since I can't think of a valid case when one would want to ignore the default value, I'd suggest always adding the DefaultValueResolver to the list when a pinned resolver is used.

[nicolas-grekas]

Can you please revert #50340 in the patch also please? Your approach makes it unneeded.

[HypeMC]

Can you please revert #50340 in the patch also please? Your approach makes it unneeded.

Done

[nicolas-grekas]

Thank you @HypeMC.