[BUGFIX] keep image of nominee on save

KUDOS Nicole Cordes

Classes/ViewHelper/Form/UploadViewHelper.php

@@ -80,15 +80,11 @@ class UploadViewHelper extends CoreUploadViewHelper
         if ($this->getMappingResultsForProperty()->hasErrors()) {
             return null;
         }
-        $resource = $this->getValue(false);
+        $resource = $this->getValueAttribute();
         if ($resource instanceof \TYPO3\CMS\Extbase\Domain\Model\FileReference) {
             return $resource;
         }
-        return $this->propertyMapper->convert($resource, FileReference::class);
-    }
 
-    private function getValue($param){
-        //TODO
-        return null;
+        return $this->propertyMapper->convert($resource, FileReference::class);
     }
 }