fixup! move stmt key to property candidate value object

Author: TomasVotruba

rules/Php80/ValueObject/PropertyPromotionCandidate.php

@@ -6,7 +6,6 @@
 
 use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Param;
-use PhpParser\Node\Stmt\Expression;
 use PhpParser\Node\Stmt\Property;
 use Rector\Exception\ShouldNotHappenException;