fix: resolve clippy redundant_closure warning in moments-api

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/moments-api/src/main.rs

@@ -170,7 +170,7 @@ async fn og_contributions(
         .iter()
         .filter_map(|s| s.earliest)
         .min()
-        .unwrap_or_else(|| Utc::now())
+        .unwrap_or_else(Utc::now)
         .date_naive();
     let today = Utc::now().date_naive();