Reset MoneyCostCalculator before generating project status report

If you generate the report and afterwards you report some expenses in a project,
the MoneyCostCalculator cache still keep the previous value for the report.

Now the MoneyCostCalculator cache is reseted every time the report is generated.

FEA: ItEr77S09WBSReport

libreplan-webapp/src/main/java/org/libreplan/web/reports/ProjectStatusReportModel.java

@@ -94,6 +94,8 @@ public class ProjectStatusReportModel implements IProjectStatusReportModel {
     @Override
     @Transactional(readOnly = true)
     public List<ProjectStatusReportDTO> getProjectStatusReportDTOs(Order order) {
+        moneyCostCalculator.resetMoneyCostMap();
+
         List<OrderElement> orderElements;
         if (order != null) {
             orderDAO.reattach(order);