KFileSystemType: recognize ntfs3

With ntfs3 linux driver, we don't recognize Ntfs anymore, causing errors.

The magic value was found empirically and confirmed to be used in systemd: https://github.com/systemd/systemd/blob/main/src/basic/missing_magic.h

This missing causes kio not to replace <>:"/\|?* by '_' and copying failing and many other possible misbehavior.

Candidate for backporting.