refactor(setter): remove one layer of indirection

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.33%. Comparing base (d149a15) to head (c325d93).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #800 +/- ## ======================================= Coverage 90.33% 90.33% ======================================= Files 52 52 Lines 2255 2255 ======================================= Hits 2037 2037 Misses 207 207 Partials 11 11 ``` | [Flag](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/800/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/favonia/cloudflare-ddns/pull/800/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia) | `90.33% <100.00%> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=favonia#carryforward-flags-in-the-pull-request-comment) to find out more.

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