Emscripten: change the localStorage key used for preferences.

I picked pathname + "#preferences" because Ben suggested either that
or pathname + "/preferences", and I thought the former sounded neater.
But Ben now suggests that it might be better to avoid using # in the
key, just in case anyone should later want to use the whole URL
_including_ the fragment ID as the key for some other localStorage
usage - for example, autosaved progress per puzzle _instance_, keying
off the puzzle URL with a fragment ID in the game description.

So, per Ben's replacement suggestion, change the "#" to a space.

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