Fix CMake warning on macOS
Fix warning:
CMake Deprecation Warning at .../ECM/kde-modules/KDEInstallDirs.cmake:324 (message): BUNDLE_INSTALL_DIR is deprecated, use KDE_INSTALL_BUNDLEDIR instead.
(cherry picked from commit 91ebc82ed9e580dd5af4ae9feda7cc810de7b9b0)