Revert "Don't use PhpStorm stubs for Ds\\ extension"

This reverts commit 13d0f3d.

src/Reflection/ReflectionProvider/ClassBlacklistReflectionProvider.php

@@ -37,7 +37,7 @@ public function __construct(
 
 	public function hasClass(string $className): bool
 	{
-		if ($this->phpStormStubsSourceStubber->hasClass($className) && $className !== \Generator::class && strpos($className, 'Ds\\') !== 0) {
+		if ($this->phpStormStubsSourceStubber->hasClass($className) && $className !== \Generator::class) {
 			// check that userland class isn't aliased to the same name as a class from stubs
 			if (!class_exists($className, false)) {
 				return false;