small fixes

Changed static usages of metadatamethods, fixed ambum error.

src/main/java/NTNU/IDATT1002/service/ImageService.java

@@ -29,7 +29,6 @@ public class ImageService {
      */
     public ImageService(EntityManager entityManager) {
         this.imageRepository = new ImageRepository(entityManager);
-        this.metaDataExtractor = new MetaDataExtractor();
         this.tagService = new TagService(entityManager);
     }