fix(APIModalSubmitRadioGroupComponent): Nullable value

[Jiralite]

https://canary.discord.com/channels/1317206872763404478/1326626041397248113/1468021894266486904

"data": {
  "custom_id": "test",
  "components": [
    {
      "type": 18,
      "id": 1,
      "component": {
        "value": "option1",
        "type": 21,
        "id": 2,
        "custom_id": "test"
      }
    },
    {
      "type": 18,
      "id": 3,
      "component": {
        "value": null,
        "type": 21,
        "id": 4,
        "custom_id": "test2"
      }
    }
  ]
},

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Project	Deployment	Actions	Updated (UTC)
discord-api-types	Ready	Preview, Comment	Feb 6, 2026 9:46pm