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

[Anton Khorev]

- JOSM sends `Access-Control-Allow-Origin`
- Merkaartor [also sends it](https://github.com/openstreetmap/merkaartor/blob/7ae76834bcba9934f38d85058f7372fc016c1d1c/src/Utils/RemoteControlServer.cpp#L72).
- Potlatch doesn't

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