x11-wm/theseus-ship: unbreak after 5871ae6a0942
CMake Error at CMakeLists.txt:69 (find_package):
Could not find a package configuration file provided by "KDecoration2" (requested version 6) with any of the following names: KDecoration2Config.cmake kdecoration2-config.cmake
(cherry picked from commit dd2e365fac257cbc60875ad360f9caf119d59130)