On JavaScript, string.replace \r splits \r\n graphemes

I was expecting `string.replace` to treat control characters like any other code points, but then ran into this behaviour which looks wrong.

The issue is only on the Erlang target, works fine under JS.

I can dig a bit deeper if it would be helpful, possible that other control characters are affected too.

```gleam
import gleam/bit_array
import gleam/string
import gleeunit
import gleeunit/should

pub fn string_replace_test() {
// Check \r\n binary representation is as expected
"\r\n"
|> bit_array.from_string
|> bit_array.inspect
|> should.equal("<<13, 10>>")

// Test replacing \n with a space character (U+0020)
"\r\n"
|> string.replace("\n", " ")
|> bit_array.from_string
|> bit_array.inspect
|> should.equal("<<13, 32>>")

// Test replacing \r with a space character (U+0020) fails with:
//
// Values were not equal
// expected: "<<32, 10>>"
// got: "<<13, 10>>"
//
"\r\n"
|> string.replace("\r", " ")
|> bit_array.from_string
|> bit_array.inspect
|> should.equal("<<32, 10>>")
}
```