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/snippet_provider/src/lib.rs

@@ -182,7 +182,7 @@ impl SnippetProvider {
     ) -> Vec<Arc<Snippet>> {
         let mut user_snippets: Vec<_> = self
             .snippets
-            .get(&language)
+            .get(language)
             .cloned()
             .unwrap_or_default()
             .into_iter()