fix: don't self-close empty script tags

[brentd]

Hi, I encountered a bug in v2 of templ where <script src="..."></script> elements are being self-closed by the formatter and end up looking like this:

<script src="..."/></script>

I added a reproducing test case and fixed it, but I'm not sure if my implementation change makes sense.

Thanks for the review and thanks for making templ, I love the concept!

[a-h]

Oops, good catch, thanks! I'll check it out.

And thanks for using templ. I'm using it in production with a company - it's producing hundreds of HTML documents that get converted into contracts every day.

[a-h]

Thanks for the contribution! 👍🏻