Fix performance bar from sticking on Firefox

On Firefox, the `Gitlab performance bar` console log sticks
in the devtool console so Firefox users have to keep scrolling
down after every page load to go back to the default tailing
of new console logs. This commit fixes this.

app/assets/javascripts/performance_bar/performance_bar_log.js

@@ -43,7 +43,7 @@ const logUserTimingMetrics = () => {
 const initPerformanceBarLog = () => {
   console.log(
     `%c ${String.fromCodePoint(0x1f98a)} GitLab performance bar`,
-    'width:100%;background-color: #292961; color: #FFFFFF; font-size:24px; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto; padding: 10px;display:block;padding-right: 100px;',
+    'width:100%; background-color: #292961; color: #FFFFFF; padding: 10px; display:block;',
   );
 
   initVitalsLog();