Fix feature extractor resizing bug (#5)

- Fix feature extractor resizing bug (9cb3acb5f711ff82a0329b5f2084d8ac7135e4eb)


Co-authored-by: Alara Dirik <adirik@users.noreply.huggingface.co>

preprocessor_config.json

@@ -18,5 +18,5 @@
   "processor_class": "OwlViTProcessor",
   "resample": 3,
   "rescale": true,
-  "size": 768
+  "size": (768, 768)
 }