[openstreetmap/openstreetmap-website] Use $.ajax instead of iframe to make remote control requests (PR #3760)

[Anton Khorev]

In modern browsers it's possible to do [no-cors fetch](https://developer.mozilla.org/en-US/docs/Web/API/Request/mode#no-cors) instead of adding hidden elements and altering their src:

```
fetch(url, { mode: "no-cors" })
```

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