fix(message-sidebar): remove faulty component. fixes T2391.

Summary: I'm proposing this patch as a temp fix for this issue. Desired functionality should probably be defined before adding more code.

Test Plan: Attempting to test manually... can't get my runtime edgehill to propagate these changes tho :(

Reviewers: bengotow

Reviewed By: bengotow

Maniphest Tasks: T2391

Differential Revision: https://phab.nylas.com/D1911

static/package-template/lib/my-message-sidebar.cjsx

@@ -52,7 +52,7 @@ class MyMessageSidebar extends React.Component
     #    mode={RetinaImg.Mode.ContentIsMask}/>
     #
     <div className="header">
-      <h1>Hi there {@state.contact.name}!</h1>
+      <h1>{@state.contact.displayName()} is the focused contact.</h1>
     </div>
 
   _renderPlaceholder: =>