[BUG] binding properties are incorrectly minified

[vouillon]

Describe the bug
Consider this piece of code:

function f (x) {
  let {toto} = x;
  return toto
}

It is minified into:

function
f(a){let{b}=a;return b}

which is not correct.

Expected behavior
Js_of_ocaml 5.4.0 outputs this result which is correct

function
f(a){let{toto:b}=a;return b}

Versions
This is with Js_of_ocaml 5.6.0.

[hhugo]

Culprit is https://github.com/ocsigen/js_of_ocaml/blame/df7fe22450a1b52bd81d38142277e4abc61179e0/compiler/lib/js_traverse.ml

[vouillon]

I think that Prop_ident (i, e) should be handled the same way as Prop_binding (PNI id, (BindingIdent i, e)) (where i = S {name = id; _}) when renaming variables.