Preserve jsx with custom module

[nojaf]

It was mentioned on the forum that -bs-jsx-preserve doesn't work in combination with -bs-jsx-module.

Sample to reproduce:

dune exec bsc -- ./tests/tests/src/jsx_preserve_custom_module.res       

@cristianoc PPX seems fine, and I believe the information gets lost before reaching js_dump.
Would you have any guess what is different for this code path?

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commit: 6de73df

[nojaf]

Original reported via https://github.com/Fattafatta/rescript-v12-test

[cristianoc]

@nojaf could this be involved?

        let element_binding =
          match config.module_ |> String.lowercase_ascii with
          | "react" -> Lident "ReactDOM"
          | _generic -> module_access_name config "Elements"
        in