[openstreetmap/openstreetmap-website] Fix month label index desync causing missing labels (PR #6725)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6725)

As I suspected, changing the server code to this:

```ruby
    # Get unique months with repeating months and count into the next year with numbers over 12
    month_offset = 0
    months = ((from - 2.weeks).to_date..(to + 1.week).to_date)
             .map(&:month)
             .chunk_while { |before, after| before == after }
             .map(&:first)
    months = months.take(1) + months.drop(1).map do |month|
      month_offset += 12 if month == 1
      month + month_offset
    end
```

which only adds the extra offset when we see January after another month fixes the problem.

That code's not very nice though and so far I haven't come up with a cleaner way to do it...

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