Deal with a rare encoding problem in HTML serialization

When listing tiddlers if the query string is not url escaped
we need to make sure we get it to the desired form.
Revert "Deal with a rare encoding problem in HTML serialization"

This reverts commit 6c350b639ccfb99830cc4495671ea9a26d072aea.

Not the right fix.
Make query string into unicode so it concatenates well.

If the query string is not utf-8 we would have had an
error at the top of the wsgi stack.
release 1.4.3 with unicode fix