Do not print log if a peer's new total_score is same with the previous

Author: majecty

sync/src/block/downloader/header.rs

@@ -74,7 +74,9 @@ impl HeaderDownloader {
     }
 
     pub fn update(&mut self, total_score: U256, best_hash: H256) -> bool {
-        if self.total_score < total_score {
+        if self.total_score == total_score {
+            true
+        } else if self.total_score < total_score {
             self.total_score = total_score;
             self.best_hash = best_hash;