fdo#38457: Always set column offset to 0

Setting it to anything else moves field indexes off-by-N and causes crash
in some cases (the original code has been unused since 2004 at least)

sc/source/core/data/dpobject.cxx

@@ -1876,9 +1876,6 @@ bool ScDPObject::FillOldParam(ScPivotParam& rParam) const
     // ppLabelArr / nLabels is not changed
 
     SCCOL nSrcColOffset = 0;
-    if (IsSheetData())
-        // source data column offset is only for internal sheet source.
-        nSrcColOffset = pSheetDesc->GetSourceRange().aStart.Col();
 
     bool bAddData = ( lcl_GetDataGetOrientation( xSource ) == sheet::DataPilotFieldOrientation_HIDDEN );
     lcl_FillOldFields(