Follow up to r482017: upstream address was not updated in pkg-descr of
x11-themes/freebsd-8k-wallpapers
x11-themes/sddm-freebsd-black-theme
x11-themes/slim-freebsd-black-theme
Reported by: swills
Approved by: tcberner (mentor)
x11-themes/slim-freebsd-black-theme: update to version 1.2.
Update MAINTAINER address.
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D17293