DolphinWX: Update how localization files are installed

On macOS, we want them copied in the bundle directly, otherwise we will
install them later in the system folder.
Obviously not working for Windows, but that's not any different from before!

CMakeLists.txt

@@ -1002,9 +1002,6 @@ add_subdirectory(Source)
 ########################################
 # Install shared data files
 #
-if(NOT APPLE)
-	install(DIRECTORY Data/Sys/ DESTINATION ${datadir}/sys PATTERN)
-endif()
 if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Linux|FreeBSD|OpenBSD|Darwin")
 	install(FILES Data/license.txt DESTINATION ${datadir})
 endif()