Bug 451002 - Use the new search textbox binding in the subscribe dialog, r=mkmelin

mail/base/content/subscribe.xul

@@ -85,7 +85,8 @@
             <row align="center">
               <label value="&namefield.label;" accesskey="&namefield.accesskey;" 
                      id="namefieldlabel" control="namefield"/>
-              <textbox id="namefield" flex="1" type="timed" timeout="300" oncommand="Search();"/>
+              <textbox id="namefield" flex="1" type="search" timeout="300"
+                       oncommand="Search();"/>
             </row>
           </rows>
         </grid>