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

[Anton Khorev]

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

`2**(8+zoom)` = world size in pixels
`180` = span of latitude values
`2**(8+zoom) / 180` = number of pixels in one degree. If there are 100 pixels in one degree, you need log10(100) = 2 fractional digits to represent a degree value for a given pixel offset

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