Grammar doesn't include source.js for module javascript block

[alexr00]

From @csvn here https://github.com/microsoft/vscode/issues/76181

The built-in Pug basic language support extension does not give any syntax highlighting for <script type="module"> code. Regular <script> tags work as they should (including when type="text/javascript" is used).

Steps to Reproduce:

1. Open a .pug file with built-in Pug extension active
2. Add a script(type="module"). block
3. Write any Javascript
4. Content is formatted as plain text