lua: get rid of knot_rrset_txt_dump
I believe it was unused, so no risk was caused, but better remove it. There's the complication that its signature has changed since libknot-2.4.0. Fixes https://gitlab.labs.nic.cz/knot/resolver/issues/146
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I believe it was unused, so no risk was caused, but better remove it. There's the complication that its signature has changed since libknot-2.4.0. Fixes https://gitlab.labs.nic.cz/knot/resolver/issues/146