Calc sort: Use method GetSortKeyCount from SortParam
Calc sort: Use method GetSortKeyCount from SortParam

Change-Id: I4500ba71abeba5fe8293cea22b10fd910e46059f
Reviewed-on: https://gerrit.libreoffice.org/3816
Reviewed-by: Markus Mohrhard <17b5858c03a410e5ca9ee070d93f5b34144a17e4@googlemail.com>
Tested-by: Markus Mohrhard <17b5858c03a410e5ca9ee070d93f5b34144a17e4@googlemail.com>

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core