Update center_panel.jsx

As discussed in UX meeting. Text change to help users understand that they are just scrolled up in the channel view rather than in a different interface when they jump to a search result.
"You are viewing the archives. Click here to jump to recent messages." -> "Click here to jump to recent messages"

web/react/components/center_panel.jsx

@@ -69,7 +69,7 @@ export default class CenterPanel extends React.Component {
                     onClick={handleClick}
                 >
                     <a href=''>
-                        {'You are viewing the Archives. Click here to jump to recent messages. '}
+                        {'Click here to jump to recent messages. '}
                         {<i className='fa fa-arrow-down'></i>}
                     </a>
                 </div>