Remove duplicate const from gr-message

Change-Id: I37dc0ff7eafa84e8af8257247adbbfb760394015
diff --git a/polygerrit-ui/app/elements/change/gr-message/gr-message.js b/polygerrit-ui/app/elements/change/gr-message/gr-message.js
index 7305cdb..29abaa0 100644
--- a/polygerrit-ui/app/elements/change/gr-message/gr-message.js
+++ b/polygerrit-ui/app/elements/change/gr-message/gr-message.js
@@ -215,7 +215,6 @@
       }
       const extremes = labelExtremes[score.label];
       if (extremes) {
-        const extremes = labelExtremes[score.label];
         const intScore = parseInt(score.value, 10);
         if (intScore === extremes.max) {
           classes.push('max');