Fix file not found loading-icon.gif

cps/templates/admin.html

@@ -144,7 +144,7 @@
       <div class="modal-body text-center">
         <p>{{_('Do you really want to restart Calibre-Web?')}}</p>
           <div id="spinner" class="spinner"  style="display:none;">
-                <img id="img-spinner" src="{{ url_for('static', filename='css/images/loading-icon.gif') }}"/>
+                <img id="img-spinner" src="{{ url_for('static', filename='css/libs/images/loading-icon.gif') }}"/>
           </div>
           <p></p>
         <button type="button" class="btn btn-default" id="restart" >{{_('Ok')}}</button>
@@ -176,7 +176,7 @@
       </div>
       <div class="modal-body text-center">
           <div id="spinner2" class="spinner2"  style="display:none;">
-                <img id="img-spinner2" src="{{ url_for('static', filename='css/images/loading-icon.gif') }}"/>
+                <img id="img-spinner2" src="{{ url_for('static', filename='css/libs/images/loading-icon.gif') }}"/>
           </div>
           <p></p>
          <div id="Updatecontent"></div>