Hide acltable heading for voice-only output

plugins/acl/skins/larry/templates/table.html

@@ -1,6 +1,6 @@
 <div id="aclcontainer" class="uibox listbox">
 <div id="acllist-content" class="scroller withfooter" aria-labelledby="aria-label-acltable">
-    <h2 class="boxtitle" id="aria-label-acltable"><roundcube:label name="acl.ariasummaryacltable" /></h2>
+    <h2 class="voice" id="aria-label-acltable"><roundcube:label name="acl.ariasummaryacltable" /></h2>
     <roundcube:object name="acltable" id="acltable" class="records-table" summary="acl.ariasummaryacltable" role="listbox" />
 </div>
 <div id="acllist-footer" class="boxfooter">