Inline shouldNotCarryForwardPropertyFetchInClosure check

The method was a trivial one-liner, so inline the instanceof check
directly at the call site and remove the private method.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phpstan-bot

src/Analyser/MutatingScope.php

@@ -2152,7 +2152,7 @@ public function enterAnonymousFunctionWithoutReflection(
 				}
 			}
 
-			if ($this->shouldNotCarryForwardPropertyFetchInClosure($expr)) {
+			if ($expr instanceof PropertyFetch) {
 				continue;
 			}
 
@@ -2222,11 +2222,6 @@ public function enterAnonymousFunctionWithoutReflection(
 		);
 	}
 
-	private function shouldNotCarryForwardPropertyFetchInClosure(Expr $expr): bool
-	{
-		return $expr instanceof PropertyFetch;
-	}
-
 	private function expressionTypeIsUnchangeable(ExpressionTypeHolder $typeHolder): bool
 	{
 		$expr = $typeHolder->getExpr();