Fix update button on cluster summary so it doesn't fall outside the box.

perf/res/imp/cluster.html

 <!--
   The common.js file must be included before this file.
 
   This in an HTML Import-able file that contains the definitions
   for the following elements:
 
     <cluster-summary-sk>
     <toggle-display-sk>
     <word-cloud-sk>
 
@@ skipping 167 matching lines @@
         <paper-shadow z="1">
           <div id=clStatus class="clStatus {{ {hidden: summary.ID == -1} | tokenList }} disabled" vertical layout>
             <p class="disabledMessage">You must be logged in to change the status.</p>
             <paper-radio-group id=status selected="{{cachedStatus}}" horizontal layout>
               <b class=status>Status:</b>
               <paper-radio-button name="New" label="New"></paper-radio-button>
               <paper-radio-button name="Ignore" label="Ignore"></paper-radio-button>
               <paper-radio-button name="Bug" label="Bug"></paper-radio-button>
             </paper-radio-group>
             <paper-input value="{{summary.Message}}" label="Note" id="message"></paper-input>
-            <paper-button flex self-end id=update>Update</paper-button>
+            <paper-button self-end id=update>Update</paper-button>
           </div>
         </paper-shadow>
         <toggle-display-sk>Word Cloud</toggle-display-sk>
         <word-cloud-sk items="{{summary.ParamSummaries}}"></word-cloud-sk>
       </div>
     </div>
   </template>
   <script>
     (function() {
 
@@ skipping 101 matching lines @@
         truncHash: function(value) {
           if (value) {
             return value.substring(0, 7);
           }
         },
 
       });
     })();
   </script>
 </polymer-element>