privacy: Connect 'activate-link' on row subtitle (GNOME 44)

Georges Basile Stavracas Neto requested to merge gbsneto/181-stable into master

This is a massive hack, can break on future releases of libadwaita, and must be confined specifically to stable releases where a proper fix cannot be made.

Crawl through the widget hierarchy to find the subtitle label of the action row, and connect to the 'activate-link' signal from it.

Closes #181 (closed)

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