fix: removeHiddenElems is not idempotent #1955
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removeHiddenElems was only removing the last of a chain of unreferenced elements - e.g., if a is referenced by b is referenced by c, and all are otherwise unreferenced, only c will be removed.
There is no change in regression mismatches or pixel mismatches. Total file compression in single-pass mode is increased by 19,540,048 bytes (2.5%). With the previous version, one link in the chain would be removed with each pass in multi-pass mode.