[view] fix label for default sort method in CGUIViewState

This adjusts the label which is used if no sort method is defined (Sort by: Name) to 'Name' as it's used in all CGUIViewState derivatives.

Also discussed at trac http://trac.xbmc.org/ticket/15045

@jmarshallnz for a quick look
Yes please - that way we don't have to grep the strings.po to find what it is :)