Unbound host overrides breaks when adding a wildcard entry

[kriansa]

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• I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
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Describe the bug

Adding a DNS entry named * (wildcard) will be allowed by UI but will break Unbound initialization, thus making it immediately offline after applying the change.

According to the manual, wildcards should be accepted as host names for host overrides.

To Reproduce

Steps to reproduce the behavior:

1. Go to 'Services', then 'Unbound DNS', then 'Overrides'
2. Click on '+' button and add a new override
3. Set Host to '*', domain to anything (e.g. opnsense.com), type A, IP address '127.0.0.1'
4. Save, then click Apply
5. See that Unbound will stop and won't start again unless you remove that entry and apply again

Expected behavior

Unbound should stay up, and a subsequent drill xyz.opnsense.com should return an entry to '127.0.0.1'.

Environment

I don't think it's relevant.