* lisp/tab-bar.el: Ignore daemon's initial frame (bug#78896).

* lisp/tab-bar.el: Ignore daemon's initial frame (bug#78896).

(tab-bar--update-tab-bar-lines): Don't set the frame parameter
'tab-bar-lines' in daemon's initial frame because it messes up the
frames when 'format-mode-line' called from 'tab-bar-format-global'
on daemon's initial frame forces focus switch to daemon's initial
frame.  Also don't set 'default-frame-alist' in daemon mode because
'frame-notice-user-settings' copies the frame parameter 'tab-bar-lines'
from 'default-frame-alist' to daemon's initial frame.  Here updating
'default-frame-alist' is not much needed anyway since the frame
parameter 'tab-bar-lines' for new frames is set in 'make_terminal_frame'
and 'x-create-frame'.  'default-frame-alist' might be need only
to handle non-default 'tab-bar-show', but this can be handled by
'toggle-frame-tab-bar' called from 'server-after-make-frame-hook'.
(toggle-frame-tab-bar): Document a useful case of calling it
from 'server-after-make-frame-hook'.

(cherry picked from commit cd8319677d8869d60fefca6d88cf994726058e9e)