When there are no user-provided bounds provided in the writer
(as in: min/max_lat/lng_e7 properties) the writer mistakenly
defaults to -180,-90,180,90 for these properties.
e1228f5df1/python/pmtiles/tile.py (L277-L283)
But these properties need to be multiplied by 10000000 as
seen e.g. in this examples and as indicated by the "_e7"
e1228f5df1/python/examples/create_raster_example.py (L29-L32)
Without this fix we were seeing pmtiles with bounds around null
island, because the order of magnitude was wrong.