SYLK import: init nRefCol,nRefRow with start col,row instead of 1,1

So in a malformed document that does not specify ;X;Y;C;R before ;M a 1x1
matrix formula is created at nStartCol,nStartRow instead of 2x2

Change-Id: Idcc0f9d8c65bb142587fa6419af6f4dcb6209a0e

sc/source/ui/docshell/impex.cxx

@@ -1729,8 +1729,8 @@ bool ScImportExport::Sylk2Doc( SvStream& rStrm )
         OString aByteLine;
         SCCOL nCol = nStartCol;
         SCROW nRow = nStartRow;
-        SCCOL nRefCol = 1;
-        SCROW nRefRow = 1;
+        SCCOL nRefCol = nCol;
+        SCROW nRefRow = nRow;
         rStrm.Seek( nOldPos );
         for( ;; )
         {