Validation does not catch objects with "unknown" keys

[Remi-Gau]

Spotted by @mwmaclean

{
  "Name": "my_first_model",
  "BIDSModelVersion": "1.0.0",
  "Description": "My first BIDS model: a simple 2-condition contrast.",
  "Input": {
    "task": ["stroop"]
  },
  "Nodes": [
    {
      "Level": "Run",
      "Name": "run",
      "GroupBy": ["run", "subject"],
      "Model": {
        "X": ["congruent", "incongruent", "nuissance1", "nuissance2", 1],
        "Type": "glm"
      },
      "ControlContrasts": [                <----- This Should be Contrasts but the validator is happy with it
        {
          "Name": "incongruent_vs_congruent",
          "ConditionList": ["incongruent", "congruent"],
          "Weights": [1, -1],
          "Test": "t"
        }
      ]
    }
  ]
}