x11-toolkits/libadwaita: drop bogus PORTSCOUT limit

• 3da07b6b1695 updated to an odd minor version
• upstream has stable libadwaita-1-1 branch
• many other distributions updated to 1.1.* in the past
• odd-even scheme appears deprecated, not used by new projects

See also https://discourse.gnome.org/t/new-gnome-versioning-scheme