[900] Add missing "type" to applicator meta-schema

(cherry picked from commit 4af51fc)

Author: ssilverman

Diff for: meta/applicator.json

@@ -7,6 +7,7 @@
     "$recursiveAnchor": true,
 
     "title": "Applicator vocabulary meta-schema",
+    "type": ["object", "boolean"],
     "properties": {
         "additionalItems": { "$recursiveRef": "#" },
         "unevaluatedItems": { "$recursiveRef": "#" },