tdf#114919: fix ods export in ODF 1.2 strict

See Valgrind trace here:
https://bugs.documentfoundation.org/attachment.cgi?id=147891
which contains bt

Due to a8b7c724
"
add error to office:value-type for calc cells and fdo#51810
For cached value import we need the information which cells are error
cells. For ODF 1.2 extended we therefore export now calcext:office-value
with the additional value "error".
"

Change-Id: I13547ecc7ef8c1c4e1a236229d3b19d51f12470b
Reviewed-on: https://gerrit.libreoffice.org/65728
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

sc/source/filter/xml/xmlexprt.cxx

@@ -3248,7 +3248,7 @@ void ScXMLExport::WriteCell(ScMyCell& aCell, sal_Int32 nEqualCellCount)
                         {
                             GetNumberFormatAttributesExportHelper()->SetNumberFormatAttributes(
                                     aCell.nNumberFormat, pDoc->GetValue(aCell.maCellAddress));
-                            if( getDefaultVersion() >= SvtSaveOptions::ODFVER_012 )
+                            if( getDefaultVersion() > SvtSaveOptions::ODFVER_012 )
                             {
                                 GetNumberFormatAttributesExportHelper()->SetNumberFormatAttributes(
                                         aCell.nNumberFormat, pDoc->GetValue(aCell.maCellAddress), false, XML_NAMESPACE_CALC_EXT, false );