tdf#122031 Change element order for OOXML compatibility.

Change-Id: I8cca2db6157996dd25afa4c95e769725188fdfb9
Signed-off-by: Gülşah Köse <gulsah.kose@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/66686Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Jenkins

oox/source/export/chartexport.cxx

@@ -3232,6 +3232,7 @@ void ChartExport::exportDataLabels(
             continue;
 
         pFS->startElement(FSNS(XML_c, XML_dLbl), FSEND);
+        pFS->singleElement(FSNS(XML_c, XML_idx), XML_val, I32S(nIdx), FSEND);
 
         if (GetProperty(xLabelPropSet, "NumberFormat") || GetProperty(xLabelPropSet, "PercentageNumberFormat"))
         {
@@ -3246,7 +3247,6 @@ void ChartExport::exportDataLabels(
         }
 
         // Individual label property that overwrites the baseline.
-        pFS->singleElement(FSNS(XML_c, XML_idx), XML_val, I32S(nIdx), FSEND);
         exportTextProps( xPropSet );
         writeLabelProperties(pFS, this, xLabelPropSet, aParam);
         pFS->endElement(FSNS(XML_c, XML_dLbl));