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/storybook/src/assets.rs

@@ -19,7 +19,7 @@ impl AssetSource for Assets {
         Self::get(path)
             .map(|f| f.data)
             .ok_or_else(|| anyhow!("could not find asset at path \"{}\"", path))
-            .map(|data| Some(data))
+            .map(Some)
     }
 
     fn list(&self, path: &str) -> Result<Vec<SharedString>> {