Extractor: fixed extracting attributes [Closes #98]

Author: dg

src/PhpGenerator/Extractor.php

@@ -359,7 +359,7 @@ private function addCommentAndAttributes($element, Node $node): void
 			foreach ($group->attrs as $attribute) {
 				$args = [];
 				foreach ($attribute->args as $arg) {
-					$value = new Literal($this->getReformattedContents([$arg], 0));
+					$value = new Literal($this->getReformattedContents([$arg->value], 0));
 					if ($arg->name) {
 						$args[$arg->name->toString()] = $value;
 					} else {

tests/PhpGenerator/expected/Extractor.classes.80.expect

@@ -15,7 +15,7 @@ class Class8
  * Description of class.
  */
 #[\ExampleAttribute]
-#[NamedArguments(foo: foo: 'bar', bar: bar: [1, 2, 3])]
+#[NamedArguments(foo: 'bar', bar: [1, 2, 3])]
 class Class9
 {
 	/** Commented */