chore: Fix several style lints (#17488)

It's not comprehensive enough to start linting on `style` group, but
hey, it's a start.

Release Notes:

- N/A

crates/language_model/src/registry.rs

@@ -176,7 +176,7 @@ impl LanguageModelRegistry {
         model_id: &LanguageModelId,
         cx: &mut ModelContext<Self>,
     ) {
-        let Some(provider) = self.provider(&provider) else {
+        let Some(provider) = self.provider(provider) else {
             return;
         };