adw-alert-dialog: Expose the body text as its a11y description
Because of the scrolled window, Orca's heuristic for finding static text ignore the body text. So, expose it as the description for the dialog.
Helps #894 (closed).
Because of the scrolled window, Orca's heuristic for finding static text ignore the body text. So, expose it as the description for the dialog.
Helps #894 (closed).