[TypedCollections] Use directly param->type->type assign on RemoveNullFromNullableCollectionTypeRector (#397)

* [TypedCollections] Use directly param->type->type assign on RemoveNullFromNullableCollectionTypeRector

* [TypedCollections] Use directly param->type->type assign on RemoveNullFromNullableCollectionTypeRector

Author: samsonasik

rules-tests/TypedCollections/Rector/ClassMethod/RemoveNullFromNullableCollectionTypeRector/Fixture/some_param_nullable.php.inc

@@ -26,7 +26,7 @@ final class SomeParamNullable
 {
     private $collection;
 
-    public function setItems(\Doctrine\Common\Collections\Collection $collection): void
+    public function setItems(Collection $collection): void
     {
         $this->collection = $collection;
     }

rules/TypedCollections/Rector/ClassMethod/RemoveNullFromNullableCollectionTypeRector.php

@@ -5,7 +5,6 @@
 namespace Rector\Doctrine\TypedCollections\Rector\ClassMethod;
 
 use PhpParser\Node;
-use PhpParser\Node\Name\FullyQualified;
 use PhpParser\Node\NullableType;
 use PhpParser\Node\Stmt\ClassMethod;
 use Rector\Doctrine\Enum\DoctrineClass;
@@ -79,7 +78,7 @@ public function refactor(Node $node): ClassMethod|null
                 continue;
             }
 
-            $param->type = new FullyQualified(DoctrineClass::COLLECTION);
+            $param->type = $realType;
             $hasChanged = true;
         }