x11/xfce4-whiskermenu-plugin: Update to 2.8.0
- Add options ACCOUNTS_SERVICE GTK_LAYER_SHELL LTO to allow disabling these new features (all enabled by defualt)
- Reorder Makefile variables to pet portfmt and portclippy
- Improve pkg-descr
- Testing shows the .desktop file gets installed only if NLS option is enabled