Failing to fetch() Wasm retries the network request

If the fetch() fails (no network, 404, whatever) here

https://github.com/emscripten-core/emscripten/blob/7ed425edb82161c3d60ef5d00f939446edddce42/src/preamble.js#L607-L608

it will be retried, regardless of why it failed here

https://github.com/emscripten-core/emscripten/blob/7ed425edb82161c3d60ef5d00f939446edddce42/src/preamble.js#L619

https://github.com/emscripten-core/emscripten/blob/7ed425edb82161c3d60ef5d00f939446edddce42/src/web_or_worker_shell_read.js#L44

The retry logic shouldn't retry the network call, because the end result is that if you pass a bad URL or serve a broken Wasm file it gets requested twice, just to make sure.

(See also https://github.com/tree-sitter/tree-sitter/pull/4775 )