tdf#121040 sc: use pixel-per-twips in X for horizontal value conversion

Change-Id: I25bc3b3ec42ef5b026c2cd9572e8ff1863ed8c2d
Reviewed-on: https://gerrit.libreoffice.org/68492Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

sc/source/core/data/column2.cxx

@@ -346,7 +346,7 @@ long ScColumn::GetNeededSize(
                 long nDocPixel = static_cast<long>( ( pDocument->GetColWidth( nCol,nTab ) -
                                     pMargin->GetLeftMargin() - pMargin->GetRightMargin() -
                                     nIndent )
-                                    * nPPT );
+                                    * nPPTX );
                 nDocPixel = (nDocPixel * 9) / 10;           // for safety
                 if ( aSize.Width() > nDocPixel )
                     bEditEngine = true;