Handle 'word_perplexity' metric without multiplying by 100

Modified the logic to avoid multiplying the 'word_perplexity' metric by 100.
Now, the multiplication by 100 is applied conditionally based on the metric
type, preserving the original value for 'word_perplexity'.

server.py

@@ -247,7 +247,7 @@ class LeaderboardServer:
                                     visible_metrics_map_word_to_header[task + "_" + metric] = self.TASKS_METADATA[task]["abbreviation"] + " " + metric
                                     metric_value = data['results'][task].get(metric)
                                     if metric_value is not None:
-                                        local_results[task + "_" + metric] = metric_value * 100
+                                        local_results[task + "_" + metric] = metric_value if metric == "word_perplexity" else metric_value * 100
                                         break  # Only the first metric of every task