Valentin Lorentz 200acdfa93 registry: Normalize values before checking they are valid
Otherwise, normalization is useless, and gives a surprising error message,
such as:

```
<user> config plugins.rss.sortfeeditems oldestfirst
<bot> Error: Valid values include 'asInFeed', 'oldestFirst', 'newestFirst', 'outdatedFirst', and 'updatedFirst', not 'oldestFirst'.
```
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..
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