Fix patch state not being able to patch for large amounts of data

[ChaoticTempest]

When patching a large payload to contract state, the sandbox near node would not it, throwing the following error:

Error: the server returned a non-OK (200) status code: [413 Payload Too Large]

This is probably to do with the fact that the network can be attacked if the requests are too big. But since this is sandbox, we can just special case it to accept large payloads.