[html] Unecessary warning when script contains quotes on the same line as an onFoo attribute using the same quotes

<!-- ⚠️⚠️ Do Not Delete This! bug_report_template ⚠️⚠️ --> <!-- Please read our Rules of Conduct: https://opensource.microsoft.com/codeofconduct/ --> <!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.50.1 - OS Version: Windows 10 2004 Steps to Reproduce: 1. Open HTML file and paste: `<script>"L"</script><a onclick="show();"></a>` 2. Notice  3. When the line is split into 2 it's not affected ```html <script>"L"</script> <a onclick="show();"></a> ``` Originally reported in: https://github.com/trullock/NUglify/issues/166. As the owner of NUglify states: The problem is the VSC HTML parser/IntelliSense when you have a script which contains quotes on the same line as an onFoo attribute using the same quotes <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes