[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
please think about contextual comments as well next time. Would be nice to get those throught the strings file one day, so whenever somebody researched a label and it's usage, please add not just the place where it's used, but probably more important in which way it's used (contextual comments make more sense to me than a note where it's being used)