Fixes #1445 - Display burger icon on History page

packages/rocketchat-ui/views/app/privateHistory.html

 <template name="privateHistory">
 	<section class="page-container page-list">
 		<header class="fixed-title">
+			{{> burger}}
 			<h2>
 				<span class="room-title">{{_ "History"}}</span>
 			</h2>