Fix date range shown in reverse in MDM Reports

(cherry picked from commit 5d23d1d6f6)

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/report/mgt/ReportManagementServiceImpl.java

@@ -315,7 +315,7 @@ public class ReportManagementServiceImpl implements ReportManagementService {
                 }
                 //Map date blocks and counts
                 resultObject.addProperty(
-                        dateFormat.format(endDate) + " - " + dateFormat.format(previousDate), sum);
+                        dateFormat.format(previousDate) + " - " + dateFormat.format(endDate), sum);
                 endDate = previousDate;
 
             }