代码优化，移除没有使用的对象

easyexcel-core/src/main/java/com/alibaba/excel/analysis/v03/handlers/BoundSheetRecordHandler.java

@@ -16,6 +16,6 @@ public class BoundSheetRecordHandler extends AbstractXlsRecordHandler implements
     @Override
     public void processRecord(XlsReadContext xlsReadContext, Record record) {
         BoundSheetRecord bsr = (BoundSheetRecord)record;
-        xlsReadContext.xlsReadWorkbookHolder().getBoundSheetRecordList().add((BoundSheetRecord)record);
+        xlsReadContext.xlsReadWorkbookHolder().getBoundSheetRecordList().add(bsr);
     }
 }