gnome-backgrounds: add 2.30.0
gnome-backgrounds: add 2.30.0

yyli/overo-oe,yyli/overo-oe,yyli/overo-oe,yyli/overo-oe,scottellis/overo-oe,scottellis/overo-oe,John-NY/overo-oe,John-NY/overo-oe,scottellis/overo-oe,yyli/overo-oe,scottellis/overo-oe,yyli/overo-oe,scottellis/overo-oe,John-NY/overo-oe,John-NY/overo-oe,yyli/overo-oe,John-NY/overo-oe,John-NY/overo-oe,yyli/overo-oe,scottellis/overo-oe,scottellis/overo-oe,John-NY/overo-oe