language: don't stringify html.tags() on accident

Checking contentOnly only tells if a tag is, you know,
content-only. But other tags are content, and they were
getting stringified here! This caused chunkwrap to intrude
where it shouldn't, thinking it really was getting passed
a string of normal, non-HTML content.

We're using html.smush() to the intended effect now,
still collapsing those tags flat and then iterating over
the contents to sanitize like usual.

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