[openstreetmap/openstreetmap-website] Granting / revoking roles for own user (#1697)

[mmd]

> maybe stop them removing their own administrator role

That's exactly what I wanted to accomplish. As there's no additional confirmation popup, I accidentally locked myself out, and had to head for the rails console.

Second attempt is now restricted to the *administrator* role: bcd4fa52893a60ed5e2d0cc72377eab78006c1eb. Code style and naming conventions may not be ideal - will happily apply suggestions for improvement.

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