[LMS-1894] got rid of warnings (screening)

...plugin/screening/shared/basic/dto/ChannelDescription.java

...in/screening/shared/basic/dto/DatasetImagesReference.java

...s/plugin/screening/shared/basic/dto/DatasetReference.java

...lugin/screening/shared/basic/dto/ExperimentReference.java

...enbis/plugin/screening/shared/basic/dto/FeatureValue.java

...ugin/screening/shared/basic/dto/FeatureVectorDataset.java

...lugin/screening/shared/basic/dto/FeatureVectorValues.java

...n/screening/shared/basic/dto/LibraryRegistrationInfo.java

...plugin/screening/shared/basic/dto/NamedFeatureVector.java

...enbis/plugin/screening/shared/basic/dto/PlateContent.java

...ugin/screening/shared/basic/dto/PlateImageParameters.java

...penbis/plugin/screening/shared/basic/dto/PlateImages.java

...nbis/plugin/screening/shared/basic/dto/PlateMetadata.java

...penbis/plugin/screening/shared/basic/dto/WellContent.java

...creening/shared/basic/dto/WellFeatureVectorReference.java

...gin/screening/shared/basic/dto/WellImageChannelStack.java

...enbis/plugin/screening/shared/basic/dto/WellLocation.java

...enbis/plugin/screening/shared/basic/dto/WellMetadata.java

...plugin/screening/shared/basic/dto/WellSearchCriteria.java