Allow the GSettings binding to set the sensitivity of the switch and use a
box to allow the sharing panel to set the sensitivity of the switch and
label without conflicting with the GSettings binding.
https://bugzilla.gnome.org/show_bug.cgi?id=692220
Increase the padding around the dialog content, fix the alignment
between the close button and content and add padding between labels and
their controls. Also ensure the dialogs are not resizable.
https://bugzilla.gnome.org/show_bug.cgi?id=691916