[openstreetmap/openstreetmap-website] Deleting a relation (and just that) creates a changeset without a bounding box (#2020)

[mmd]

I believe this is editor specific. iD as an example provides all previous relation members even for the delete call (although it wouldn't be necessary at all). This tricks the logic in Rails to believe there's no change... 


```
<osmChange version="0.6" generator="iD"><create/><modify/><delete if-unused="true"><relation id="80000000303" version="1"><member type="way" role="from" ref="4000212050"/><member type="way" role="to" ref="4000212051"/><member type="node" role="via" ref="5003081799"/><tag k="restriction" v="no_right_turn"/><tag k="type" v="restriction"/></relation></delete></osmChange>
```

@simonpoole : thanks a lot for testing! If people find recursing down relations one level helpful, I think this could also be added.

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