[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
Merge pull request #5140 from xhaggi/fix-default-sort-method-label

[view] fix label for default sort method in CGUIViewState