A one line fix for #10821 - ?

Author: landreev

src/main/java/edu/harvard/iq/dataverse/DatasetServiceBean.java

@@ -851,6 +851,7 @@ public Dataset setNonDatasetFileAsThumbnail(Dataset dataset, InputStream inputSt
         }
         dataset = DatasetUtil.persistDatasetLogoToStorageAndCreateThumbnails(dataset, inputStream);
         dataset.setThumbnailFile(null);
+        dataset.setUseGenericThumbnail(false);
         return merge(dataset);
     }