correct export for min and max databar length

Forgot the extLst entry during my earlier work. Now they are both in
sync again.

Change-Id: Ie97276fde2b9d956ad4a3e93072a6d6627c5b0bf

sc/source/filter/excel/xeextlst.cxx

@@ -123,6 +123,8 @@ XclExpExtDataBar::XclExpExtDataBar( const XclExpRoot& rRoot, const ScDataBarForm
 
     meAxisPosition = rFormatData.meAxisPosition;
     mbGradient = rFormatData.mbGradient;
+    mnMinLength = rFormatData.mnMinLength;
+    mnMaxLength = rFormatData.mnMaxLength;
 }
 
 namespace {
@@ -147,8 +149,8 @@ void XclExpExtDataBar::SaveXml( XclExpXmlStream& rStrm )
 {
     sax_fastparser::FSHelperPtr& rWorksheet = rStrm.GetCurrentStream();
     rWorksheet->startElementNS( XML_x14, XML_dataBar,
-                                XML_minLength, OString::number(0).getStr(),
-                                XML_maxLength, OString::number(100).getStr(),
+                                XML_minLength, OString::number(mnMinLength).getStr(),
+                                XML_maxLength, OString::number(mnMaxLength).getStr(),
                                 XML_axisPosition, getAxisPosition(meAxisPosition),
                                 XML_gradient, XclXmlUtils::ToPsz(mbGradient),
                                 FSEND );

sc/source/filter/inc/xeextlst.hxx

@@ -78,6 +78,8 @@ public:
 private:
     databar::ScAxisPosition meAxisPosition;
     bool mbGradient;
+    double mnMinLength;
+    double mnMaxLength;
 
     std::unique_ptr<XclExpExtCfvo> mpLowerLimit;
     std::unique_ptr<XclExpExtCfvo> mpUpperLimit;