x11-wm/mango: Update to 0.12.8
- Fix project name in pkg-descr and pkg-message after it was renamed upstream ( https://cgit.freebsd.org/ports/commit/?id=f74d5e15 ).
ChangeLog: https://github.com/mangowm/mango/releases/tag/0.12.8
Reported by: DreamMaoMao <notifications@github.com>