Revert "Update fixture for __toString() when parent mixed return, to always a…"

This reverts commit 246c7a7.

Author: samsonasik

rules-tests/DowngradePhp80/Rector/ClassMethod/DowngradeStringReturnTypeOnToStringRector/Fixture/skip_parent_mixed_return.php.inc

@@ -0,0 +1,13 @@
+<?php
+
+namespace Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Fixture;
+
+use Rector\Tests\DowngradePhp80\Rector\ClassMethod\DowngradeStringReturnTypeOnToStringRector\Source\ParentClassWithToStringMixedReturn;
+
+class SkipParentMixedReturn extends ParentClassWithToStringMixedReturn
+{
+    public function __toString()
+    {
+        return 'value';
+    }
+}