tld: fix regressions from type-hint cleanup

[dgw]

Description

Fix regressions in the tld plugin from #2471. Mea culpa…

Checklist

• [x] I have read CONTRIBUTING.md
• [x] I can and do license this contribution under the EFLv2
• [x] No issues are reported by make qa (runs make quality and make test)
  • Not really relevant since these didn't cause test failures in the first place 😛
• [x] I have tested the functionality of the things this change touches
  • Before: .tldcache update spat an error into the bot log
  • After: .tldcache update yields DEBUG level log messages indicating success

Notes

Kinda broke the parser in 3ffe55c097a53287a9d0d7aa159e2f33ae789a67, then hid that error by breaking the data fetch too in c24dfa209c3d2965939f227992c16168bc9fb69c when I tried to get too smart with one-line statements.