Update KR address format (#10674)

province(도), city(시/군)
district(구), town(읍/면), subdistrict(동/리)

data/address_formats.json

@@ -153,7 +153,8 @@
   {
     "countryCodes": ["kr"],
     "format": [
-      ["province", "city", "district"],
+      ["province", "city"],
+      ["district", "town", "subdistrict"],
       ["street", "housenumber", "unit"],
       ["postcode"]
     ]