[openstreetmap/openstreetmap-website] Set minimum changeset boundary size (#2010)

[Jamie Guthrie]

Current:
![image](https://user-images.githubusercontent.com/4670502/46381723-6ae08980-c69f-11e8-9c9e-c6e40374ee64.png)

Modified:
![image](https://user-images.githubusercontent.com/4670502/46381695-471d4380-c69f-11e8-90d2-a9fedb29d034.png)

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