ter_furn_transform doesn't check result is valid on load

[Procyonae]

Describe the bug

ter_furn_transforms aren't correctly/sufficiently being validated on load

Attach save file

N/A

Steps to reproduce

1. Add a nonsense result to a ter_furn_transform eg:

  {
    "type": "ter_furn_transform",
    "id": "invalid_transform",
    "terrain": [
      { "result": "should_cause_an_error", "valid_terrain": [ "t_wall" ] }
    ]
  }

2. Load the game and get no errors

Expected behavior

Validity checks resulting in errors

Screenshots

No response

Versions and configuration

N/A

Additional context

No response

[github-actions]

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