Make sure areas above 160000000 get rank 2 or 1 (#1623)

This is a follow-up on https://github.com/openmaptiles/openmaptiles/pull/1604 . Seminole Nation is shown in the screenshot there with rank 3 while based on area it should be 1. This PR fixes `area_rank()` function to handle areas greater than 160000000, e.g. this fixes #1622 .

Co-authored-by: Paul Norman <penorman@mac.com>

layers/place/area_rank.sql

@@ -1,12 +1,12 @@
 CREATE OR REPLACE FUNCTION area_rank(area real) RETURNS int AS
 $$
 SELECT CASE
-           WHEN area < 10000000 THEN 6
-           WHEN area BETWEEN 1000000 AND 15000000 THEN 5
-           WHEN area BETWEEN 15000000 AND 40000000 THEN 4
-           WHEN area > 40000000 THEN 3
-           WHEN area > 160000000 THEN 2
            WHEN area > 640000000 THEN 1
+           WHEN area > 160000000 THEN 2
+           WHEN area > 40000000 THEN 3
+           WHEN area > 15000000 THEN 4
+           WHEN area > 10000000 THEN 5
+           WHEN area > 0 THEN 6
            ELSE 7
            END;
 $$ LANGUAGE SQL IMMUTABLE