Avoid noscript tags where possible

[Rich-Harris]

In a situation like this...

<div>{{{raw}}}</div>

...we don't need to wrap the tag in <noscript> elements in order to remove the contents of the tag when raw changes. In fact, that's true whenever the next/previous element is known. This is presumably similar (but not identical, because the elements are usually needed both before and after) to the logic that determines whether we need <!-- comment --> nodes after if/each blocks.