Append our module path to CMAKE_MODULE_PATH
Append our module path to CMAKE_MODULE_PATH

When overwriting the complete variable, some Qt6 CMake modules like
FindWrapOpenGL.cmake do not work as expected.

cutelyst/cutelyst,buschmann23/cutelyst,cutelyst/cutelyst,buschmann23/cutelyst,buschmann23/cutelyst,cutelyst/cutelyst