Fix: Desert/rainforest data coordinate 'y' is off by 1 when their 'x' coordinate is negative #8588
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Motivation / Problem
The data that is used for generating desert or rainforest in sub-tropical is a list of TileIndexDiffC offsets, and visually look like a circumference.
The half towards NE looks misaligned.
It is similar to a bug that was uncovered back in 4846c7e for oil rig layout, in which it looked like this:
And once fixed, it looked like this:
This PR fixes the offset layout in the same manner as the oil rig layout.
Description
Make it aligned.
Limitations
Checklist for review
Some things are not automated, and forgotten often. This list is a reminder for the reviewers.