emscripten

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This setting has been causing some problems (see #22188) so I think we should just remove it.

My understanding is that most users of emscripten use it to generate JS and not html. Going forward I'm tempted to also remove the --shell-file command line flag since I'm not sure there any many compelling use cases for a custom shell html. While html generation is certainly useful for quick testing and examples, its not really something web sites are likely to use in production since they will likely have their own existing flow for build html.

Fixes: #22188