Show more (and do not remove) seas with increasing zoom level

Fix #275

layers/water_name/layer.sql

@@ -40,7 +40,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, name_de
     FROM osm_marine_point
     WHERE geometry && bbox AND (
         place = 'ocean'
-        OR (zoom_level >= 1 AND zoom_level <= "rank" AND "rank" IS NOT NULL)
+        OR (zoom_level >= "rank" AND "rank" IS NOT NULL)
         OR (zoom_level >= 8)
     );
 $$ LANGUAGE SQL IMMUTABLE;