Switch place class back to place value

layers/place/capital.sql

@@ -0,0 +1,8 @@
+CREATE OR REPLACE FUNCTION normalize_capital_level(capital TEXT)
+RETURNS INT AS $$
+    SELECT CASE
+        WHEN capital IN ('yes', '2') THEN 2
+        WHEN capital = '4' THEN 4
+        ELSE NULL
+    END;
+$$ LANGUAGE SQL IMMUTABLE STRICT;