Mark conversation as unread

Co-authored-by: Sidney Keese <sidney@carbonfive.com>

js/views/inbox_view.js

@@ -205,6 +205,8 @@
         'private'
       );
 
+      conversation.setMarkedUnread(false);
+
       const { openConversationExternal } = window.reduxActions.conversations;
       if (openConversationExternal) {
         openConversationExternal(id, messageId);