Fix issue #27: Remove the broken XlsxSheetItemInfo

Which is wrongly used to get the sheetId for definedName

src/xlsx/xlsxworkbook.cpp

@@ -539,7 +539,7 @@ bool Workbook::loadFromXmlFile(QIODevice *device)
                      data.comment = attrs.value(QLatin1String("comment")).toString();
                  if (attrs.hasAttribute(QLatin1String("localSheetId"))) {
                      int localId = attrs.value(QLatin1String("localSheetId")).toString().toInt();
-                     int sheetId = d->sheetItemInfoList[localId].sheetId;
+                     int sheetId = d->sheets.at(localId)->sheetId();
                      data.sheetId = sheetId;
                  }
                  data.formula = reader.readElementText();

src/xlsx/xlsxworkbook_p.h

@@ -47,16 +47,6 @@
 
 namespace QXlsx {
 
-struct XlsxSheetItemInfo
-{
-    XlsxSheetItemInfo(){}
-
-    QString name;
-    int sheetId;
-    QString rId;
-    QString state;
-};
-
 struct XlsxDefineNameData
 {
     XlsxDefineNameData()
@@ -91,8 +81,6 @@ public:
     QList<QSharedPointer<Chart> > chartFiles;
     QList<XlsxDefineNameData> definedNamesList;
 
-    QList<XlsxSheetItemInfo> sheetItemInfoList;//Data from xml file
-
     bool strings_to_numbers_enabled;
     bool html_to_richstring_enabled;
     bool date1904;