constraints: fix limit relating to array elements

This was originally removed in e6cd9a9
but the change to this schema file was missed.

APIs/schemas/v1.0-constraints-schema.json

@@ -3,7 +3,6 @@
   "type": "array",
   "description": "Used to express the dynamic constraints on transport parameters. These constraints may be set and changed at run time. Parameters must also conform with constraints inferred from the specification. Every transport parameter must have an entry, even if it is only an empty object.",
   "title": "Constraints",
-  "maxitems": 2,
   "items": {
     "type": "object",
     "description": "Contains the constraints for one transport leg",