bug#47234: 28.0.50; frame-inner-height fails without window system on tab-bar-height

[Eli Zaretskii]

> Cc: Eli Zaretskii <eliz@gnu.org>, 47234@debbugs.gnu.org
> From: martin rudalics <rudalics@gmx.at>
> Date: Thu, 18 Mar 2021 18:51:51 +0100
> 
>  > Please note this should be fixed on the release branch in Emacs 27.2
>  > because the change in commit 6c5ddf0e0b was recently made in emacs-27.
> 
> Then it's best to revert the frame.el part of 6c5ddf0e0b.

Ugh!