Finch can't display `GSettings` yet, but the rest of this plugin is already ported to it. So this old frame code is misleading, since it is hooked up to the `PurplePrefs`, not `GSettings`.
Testing Done:
Compiled only
Reviewed at https://reviews.imfreedom.org/r/2315/
PidginandFinch:ThePimpin' Penguin IM Clients That'reGoodfortheSoul
Thisfileintendstolistallchangestolibpurple,Pidgin,andFinch's public