remove useless image

apps/templates/_footer.html

 <div class="footer fixed">
     <div class="pull-right">
         Version <strong>1.3.1-{% include '_build.html' %}</strong> GPLv2.
-        <img style="display: none" src="http://www.jumpserver.org/img/evaluate_avatar1.jpg">
+        <!--<img style="display: none" src="http://www.jumpserver.org/img/evaluate_avatar1.jpg">-->
     </div>
     <div>
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