Fix the "default" value of "readOnly" in its schema definition

Change from the "false" string to the `false` Boolean value.

Author: dlax

schema.json

@@ -60,7 +60,7 @@
         "readOnly": {
             "description": "If true, indicates that the value of this property is controlled by the server.",
             "type": "boolean",
-            "default": "false"
+            "default": false
         },
         "multipleOf": {
             "type": "number",