Allow desktop to restore frames and windows on TTY frames

Allow desktop to restore frames and windows on TTY frames

* lisp/frameset.el (frameset-persistent-filter-alist): Add 'top',
'left', 'bottom', and 'right' to frame parameters that are shelved
and unshelved when switching from GUI to TTY frames and vice
versa.
(frameset--restore-frame): Accept two optional arguments DX and
DY, and offset by them each frame restored from TTY desktop, to
make such restored frames more prominently visible.  Force such
frames to be visible on GUI display, since the visibility
parameter is meaningless for TTY frames.
(frameset-restore): Pass DX and DY offsets to
'frameset--restore-frame', when restoring TTY frames on GUI
display.
* lisp/desktop.el (desktop-restore-frameset): Pass the
:force-onscreen argument of 'frameset-restore' as nil when
restoring frames on text-mode display.
(desktop-restore-forces-onscreen): Document that this option has
no real effect on restoring frames on text-mode display.
(desktop-restoring-frameset-p): Allow restoring frames in non-GUI
sessions, but disallow that when the selected frame is the
daemon's initial frame.  (Bug#55070)