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/theme_importer/src/assets.rs

@@ -15,7 +15,7 @@ impl AssetSource for Assets {
         Self::get(path)
             .map(|f| f.data)
             .ok_or_else(|| anyhow!("could not find asset at path \"{}\"", path))
-            .map(|result| Some(result))
+            .map(Some)
     }
 
     fn list(&self, path: &str) -> Result<Vec<SharedString>> {

crates/theme_importer/src/vscode/converter.rs

@@ -246,12 +246,12 @@ impl VsCodeThemeConverter {
                     .settings
                     .font_style
                     .as_ref()
-                    .and_then(|style| try_parse_font_style(&style)),
+                    .and_then(|style| try_parse_font_style(style)),
                 font_weight: token_color
                     .settings
                     .font_style
                     .as_ref()
-                    .and_then(|style| try_parse_font_weight(&style)),
+                    .and_then(|style| try_parse_font_weight(style)),
             };
 
             if highlight_style.is_empty() {