bug#53636: 29.0.50; face-remapping broken on master

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: 53636@debbugs.gnu.org,  tsdh@gnu.org
> Date: Sun, 30 Jan 2022 21:28:53 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Do we still need the mode-line as a parent of these two faces, or can
> > we go back to what we had before the variable-pitch mode-line changes?
> 
> The plan is to reintroduce the variable-pitch stuff after we've ironed
> out the width issues, so I'd rather keep the faces as is.  (And I think
> it makes more sense conceptually, since `mode-line' is also used as the
> parent of other faces, like `header-line'.)

OK, I will see what I can do.