Bug 1215617 - Fix minor markup problem

ui/partials/perf/comparectrl.html

@@ -14,7 +14,7 @@
         <strong>tests with no results:</strong>
         {{testNoResults}}
       </div>
-      <h4>Filters</h3>
+      <h4>Filters</h4>
       <form class="form-inline">
         <div class="form-group">
           <label for="filter-test">Test</label>