[aur-general] remove packages

Delete lxappearance-gtk2 [1]. Lxappearance in community is gtk2 so this is unnecessary. Delete lxappearance-gtk23 [2]. Lxappearance in community applies gtk3 theme settings correctly. [1] https://aur.archlinux.org/packages.php?ID=51146 [2] https://aur.archlinux.org/packages.php?ID=54465