Changed button to anchor

Changed button to anchor tag.

templates/campaign_results.html

@@ -30,9 +30,9 @@
             <h1 class="page-header" id="page-title">Results for campaign.name</h1>
         </div>
         <div class="row">
-            <button type="button" id="backButton" class="btn btn-default" onclick="window.location='/campaigns'">
+            <a href="/campaigns" class="btn btn-default">
                 <i class="fa fa-arrow-circle-o-left fa-lg"></i> Back
-            </button>
+            </a>
             <button type="button" id="exportButton" class="btn btn-primary" onclick="exportAsCSV()">
 		    <i class="fa fa-file-excel-o"></i> Export CSV
             </button>