Remove unused CMake files

src/effects/fade/CMakeLists.txt

-install(DIRECTORY package/
-        DESTINATION ${KDE_INSTALL_DATADIR}/${KWIN_NAME}/effects/kwin4_effect_fade)
-
-install(FILES package/metadata.desktop
-        DESTINATION ${KDE_INSTALL_KSERVICES5DIR}/${KWIN_NAME}
-        RENAME kwin4_effect_fade.desktop)
-
-file(COPY package/ DESTINATION ${CMAKE_BINARY_DIR}/bin/kwin/effects/kwin4_effect_fade)

src/effects/fadedesktop/CMakeLists.txt

-install(DIRECTORY package/
-        DESTINATION ${KDE_INSTALL_DATADIR}/${KWIN_NAME}/effects/kwin4_effect_fadedesktop)
-
-install(FILES package/metadata.desktop
-        DESTINATION ${KDE_INSTALL_KSERVICES5DIR}/${KWIN_NAME}
-        RENAME kwin4_effect_fadedesktop.desktop)
-
-file(COPY package/ DESTINATION ${CMAKE_BINARY_DIR}/bin/kwin/effects/kwin4_effect_fadedesktop)