rust: ensure rust can be disabled when using non-default channel

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rust: ensure rust can be disabled when using non-default channel #1175

Closed sandydoo closed 1 week ago

sandydoo commented 2 weeks ago

Previously, if channel was set to anything but nixpkgs, the rust toolchain would get added to the shell regardless of the value of languages.rust.enable.

Also deduped the logic that figures out which fenix channel to use.