[openstreetmap/openstreetmap-website] Change zoom precision function (PR #5084)

[Tom Hughes]

> `ceil( log10(2**(8+zoom) / 180) )`

Would it not be better just to use that then? Yes I can prove using logarthmic identities that what you've written is the same but it's not clear why you prefer the transformed version?

I also suspect the `Math.max` is no longer needed as it can't go negative for any sane zoom - it was needed before because log10 breaks down for zoom zero...

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