Fixes extra spacing in the new merge request dashboard

Fixes an extra spacing being visible at the bottom of each list when the users system
has scrollbars to be visible all the time.

app/assets/javascripts/merge_request_dashboard/components/app.vue

@@ -42,7 +42,7 @@ export default {
       <template #default="{ mergeRequests, count, hasNextPage, loadMore, loading, error }">
         <collapsible-section :count="count" :loading="loading || error" :title="list.title">
           <div>
-            <div class="gl-overflow-x-scroll">
+            <div class="gl-overflow-x-auto">
               <table class="gl-w-full">
                 <colgroup>
                   <col style="width: 60px" />