Restore fr lu mo addressing

addr:unit is not standard in addressing for France
in France : 800 addr:unit / 4 000 000 addr:housenumber = 0,0002 (0,02%)

This partly reverts de6b4fb6a2 in https://github.com/openstreetmap/iD/pull/4235

data/address-formats.json

@@ -53,7 +53,7 @@
         {
             "countryCodes": ["fr", "lu", "mo"],
             "format": [
-                ["unit","housenumber", "street"],
+                ["housenumber", "street"],
                 ["postcode", "city"]
             ]
         },