[openstreetmap/openstreetmap-website] Update to iD v2.17.3 (#2601)

[Tom Hughes]

Not sure what's going on but this seems to be totally broken as far as I can tell - most of the UI never appears at all and all I get is a mangled search box. Here's what it looks like in chrome:

![Screenshot from 2020-04-26 18-42-47](https://user-images.githubusercontent.com/147741/80315175-d2b07500-87ed-11ea-9fbb-31a79ffb1431.png)

There's nothing much in the way of errors in the console though to give a clue to what's going on :-(

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