AC not normalizing correctly

[ben-githubs]

Archmage-MM has the following (serialized) AC:

"ac": [
      {
        "value": [
          12,
          {
            "ac": 15,
            "condition": "with {@spell mage armor}",
            "braces": true
          }
        ],
        "__dataclass__": "AC"
      },
      {
        "value": 15,
        "note": "(with {@spell mage armor})",
        "__dataclass__": "AC"
      }
    ]

The second AC entry (15 with mage armor) appears twice, once as a distinct entry, and once inside the value of the first entry. The value of the first entry should simple be 12.

This likely indicated a problem with the conversion script.

[ben-githubs]

Resolved with PR #4