fix aspect issues

app.py

@@ -123,9 +123,9 @@ def predict(pdf, confidence, generate_file):
                 size = img.size
                 width, height = size
                 if width > height:
-                    pdf.add_page((height, width))
+                    pdf.add_page("L", (height, width))
                 else:
-                    pdf.add_page((width, height))
+                    pdf.add_page("P", (width, height))
                 pred_dict = model_type.end2end_detect(
                     img,
                     valid_tfms,