Disallow leading zeros in gnis:feature_id (#1007)

Author: watmildon

data/fields/gnis/feature_id-US.json

@@ -3,7 +3,7 @@
     "type": "identifier",
     "label": "GNIS Feature ID",
     "urlFormat": "https://edits.nationalmap.gov/apps/gaz-domestic/public/summary/{value}",
-    "pattern": "^[0-9]{1,}$",
+    "pattern": "^[1-9][0-9]*$",
     "locationSet": {
         "include": [
             "us"