correct status code when deleting wishlist entry

src/main/java/hdm/mi/growbros/controllers/WishListController.java

@@ -73,7 +73,7 @@ public class WishListController {
             @AuthenticationPrincipal User user
     ) {
         wishListService.removeFromWishList(plantId, user);
-        return ResponseEntity.ok(null);
+        return ResponseEntity.status(204).build();
     }
 
     @DeleteMapping("/remove/all")