downgrade Japanese boundaries one level

Definition is shifted by one compared to other countries,
see https://wiki.openstreetmap.org/wiki/Tag:boundary%3Dadministrative

settings/address-levels.json

@@ -21,8 +21,8 @@
           "croft" : 20,
           "subdivision" : 22,
           "allotments" : 22,
-          "neighbourhood" : [20, 22],
-          "quarter" : [20, 22],
+          "neighbourhood" : 22,
+          "quarter" : 22,
           "isolated_dwelling" : [22, 25],
           "farm" : [22, 25],
           "city_block" : 25,
@@ -236,6 +236,20 @@
           "administrative11" : 20
       }
   }
+},
+{ "countries" : ["jp"],
+  "tags" : {
+      "boundary" : {
+          "administrative7" : 16,
+          "administrative8" : 18,
+          "administrative9" : 20,
+          "administrative10" : 22,
+          "administrative11" : 24
+      },
+      "place" : {
+          "neighbourhood" : 24
+      }
+  }
 }
 
 ]