SSDM-5463: fixing build - using data set kind enum instead of string which is used as code

SVN: 38776

screening/source/java/ch/systemsx/cisd/openbis/dss/etl/jython/v2/ImagingDataSetRegistrationTransaction.java

@@ -643,7 +643,7 @@ public class ImagingDataSetRegistrationTransaction extends DataSetRegistrationTr
             ThumbnailsStorageFormat thumbnailsStorageFormat)
     {
         String thumbnailsDatasetTypeCode = findThumbnailsDatasetTypeCode(imageDataSetInformation);
-        IDataSet thumbnailDataset = createNewDataSet(thumbnailsDatasetTypeCode, "PHYSICAL");
+        IDataSet thumbnailDataset = createNewDataSet(thumbnailsDatasetTypeCode,  DataSetKind.PHYSICAL);
         thumbnailDataset.setFileFormatType(thumbnailsStorageFormat.getFileFormat()
                 .getOpenBISFileType());
         thumbnailDataset.setMeasuredData(false);