After the port to AdwPreferencesPage and the
main switch being moved out from the headerbar,
the content of the sharing dialogs got a bit hidden,
which requires more scrolling.
Fix such issue by removing the height-request
property, so the window height can follow the content
height. Do the same for the Media Sharing dialog
to keep consistency. Also, use the same window width
in both dialogs (to also keep consistency).
72abffe24e