Fix: correct caculations for mailcow widget

[shamoon]

Proposed change

Seems #3993 does not properly handle > 1 domain

Closes #4052

[
    {
      "active": "1",
      "aliases_in_domain": 0,
      "aliases_left": 400,
      "backupmx": "0",
      "bytes_total": "5076666944",
      "def_new_mailbox_quota": 3221225472,
      "def_quota_for_mbox": 3221225472,
      "description": "Some description",
      "domain_name": "domain.tld",
      "gal": "0",
      "max_new_mailbox_quota": 10737418240,
      "max_num_aliases_for_domain": 400,
      "max_num_mboxes_for_domain": 10,
      "max_quota_for_domain": 10737418240,
      "max_quota_for_mbox": 10737418240,
      "mboxes_in_domain": 0,
      "mboxes_left": 10,
      "msgs_total": "172440",
      "quota_used_in_domain": "0",
      "relay_all_recipients": "0",
      "relayhost": "0",
      "rl": false,
      "tags": [
        "tag1",
        "tag2"
      ]
    },
    {
      "active": "1",
      "aliases_in_domain": 0,
      "aliases_left": 400,
      "backupmx": "1",
      "bytes_total": "5076666944",
      "def_new_mailbox_quota": 3221225472,
      "def_quota_for_mbox": 3221225472,
      "description": "domain description",
      "domain_name": "domain2.tld",
      "gal": "0",
      "max_new_mailbox_quota": 10737418240,
      "max_num_aliases_for_domain": 400,
      "max_num_mboxes_for_domain": 10,
      "max_quota_for_domain": 10737418240,
      "max_quota_for_mbox": 10737418240,
      "mboxes_in_domain": 0,
      "mboxes_left": 10,
      "msgs_total": "172440",
      "quota_used_in_domain": "0",
      "relay_all_recipients": "0",
      "relayhost": "0",
      "rl": false,
      "tags": [
        "tag3",
        "tag4"
      ]
    }
  ]

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation only
• Other (please explain)

Checklist:

• If applicable, I have added corresponding documentation changes.
• If applicable, I have reviewed the feature and / or service widget guidelines.
• I have checked that all code style checks pass using pre-commit hooks and linting checks.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[github-actions]

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