Fix SQL update logic (patch from 3.6.2)

layers/poi/poi.yaml

@@ -36,9 +36,8 @@ layer:
     srid: 900913
     query: (SELECT geometry, name, name_en, name_de, {name_languages}, class, subclass, rank FROM layer_poi(!bbox!, z(!scale_denominator!), !pixel_width!)) AS t
 schema:
-  - ./poi_update.sql
-  - ./name.sql
-  - ./poi_polygon_update.sql
+  - ./update_poi_polygon.sql
+  - ./update_poi_point.sql
   - ./class.sql
   - ./layer.sql
 datasources: