Fix addList function to include type in API request URL - #3620

What does this PR aim to accomplish?:

The web interface was sending POST requests to /api/lists with the list type specified only in the JSON payload:

{
  "address": ["example.com"],
  "type": "block",
  "groups": [0]
}

However, the FTL API expects the type to be specified as a URL query parameter for the generic /api/lists endpoint, not in the payload. This caused requests to fail with the error: "Specify type parameter (should be either 'allow' or 'block')".

Fixes an issue reported on Discourse: https://discourse.pi-hole.net/t/blocklist-error-on-qnap-container/82625

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