[PSR4] Skip NormalizeNamespaceByPSR4ComposerAutoloadRector on has inline HTML

[samsonasik]

Given the following content,

 <h1> {{ content }} </h1>

it currently generate invalid content:

+namespace Rector\Tests\PSR4\Rector\FileWithoutNamespace\NormalizeNamespaceByPSR4ComposerAutoloadRector\Fixture;
+
+?>
 <h1> {{ content }} </h1>
+<?php

This PR patched it to skip it.

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.

[TomasVotruba]

Thanks 👍