Add trace for admin in exceptionpages

- Fix exception message not showing on raw exception page

view/templates/exception.tpl

@@ -2,5 +2,8 @@
     <img class="hare" src="images/friendica-404_svg_flexy-o-hare.png"/>
     <h1>{{$title}}</h1>
     <p>{{$message}}</p>
+{{if $trace}}
+	<pre>{{$trace nofilter}}</pre>
+{{/if}}
 	<p><button type="button" onclick="window.history.back()" class="btn btn-primary">{{$back}}</button></p>
 </div>