[ExpressionLanguage] add missing argument

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.5+
| Fixed tickets | #4578
`ParsedExpression` requires a Node instance, not an array: https://github.com/symfony/expression-language/blob/2.4/ParsedExpression.php#L31