pointer: Stop sending bankruptcy pointer updates.

Since the pointer is no longer used to set the browser's position, we
no longer need this complex code to send updates to the server during
the bankruptcy flow.

static/js/stream_popover.js

@@ -361,7 +361,7 @@ exports.register_stream_handlers = function () {
     // Mark all messages as read
     $('body').on('click', '#mark_all_messages_as_read', function (e) {
         exports.hide_all_messages_popover();
-        pointer.fast_forward_pointer();
+        unread_ops.mark_all_as_read();
         e.stopPropagation();
     });