CheckerDialog: don't set use-action-appearance property (deprecated)
CheckerDialog: don't set use-action-appearance property (deprecated)

That property comes from the GtkActivatable interface, which is
deprecated. This commit should have no effects.

Thanks to Timm Bäder for an initial patch to port gspell to GTK+ 4.

GNOME/gspell,GNOME/gspell