bug#21530: 25.0.50; tty menus disappearing

[Mark Oteiza]

I didn't see mention of this in the other tty menu reports, so hopefully
not a dupe. From emacs -nw -Q:

1. M-x display-time-mode
2. F10

Wait for the modeline to update. The tty menu will disappear or
otherwise appear broken. It's still there though, running through the
arrow keys will redraw the tty menu.

The same goes for buffers being displayed that redraw themselves
periodically. display-time-mode and display-battery-mode just happen to
be built in.