use derive tag for default implementation

Author: misaniwere

components/merino/src/curated_recommendations/mod.rs

@@ -27,17 +27,12 @@ struct CuratedRecommendationsClientInner<T: http::HttpClientTrait> {
     http_client: T,
 }
 
+#[derive(Default)]
 pub struct CuratedRecommendationsClientBuilder {
     base_host: Option<String>,
     user_agent_header: Option<String>,
 }
 
-impl Default for CuratedRecommendationsClientBuilder {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 impl CuratedRecommendationsClientBuilder {
     pub fn new() -> Self {
         Self {