Add view class to last item in perf bar

app/assets/javascripts/performance_bar/components/request_selector.vue

@@ -45,7 +45,7 @@ export default {
 };
 </script>
 <template>
-  <div id="peek-request-selector" data-qa-selector="request_dropdown">
+  <div id="peek-request-selector" data-qa-selector="request_dropdown" class="view">
     <select v-model="currentRequestId">
       <option
         v-for="request in requests"