fix repetition of last name in name_with_middle for ru

[Svetocop]

When I used the library, I paid attention that the method name_with_middle return two last names instead of middle name. So I propose the fix and more convenient name_with_middle format (at least for russian-speakers).

[bodiam]

@Svetocop I believe this issue is already fixed in https://github.com/datafaker-net/datafaker