Make sure `update_wm_hints' finds the WMShell

Make sure `update_wm_hints' finds the WMShell

* src/widget.c (update_wm_hints): Accept frame separately from
the shell widget.
(widget_update_wm_size_hints): Require WM shell to be explictly
specified.
(EmacsFrameRealize):
(EmacsFrameResize): Update callers to `update_wm_hints'.
* src/widget.h: Update prototypes.
* src/xterm.c (x_wm_set_size_hint): Pass frame widget
(ApplicationShell) and the edit widget (EmacsFrame) to
`widget_update_wm_size_hints'.  (bug#53839)