Dataset autodownload fstring updates

data/Argoverse.yaml

@@ -32,7 +32,7 @@ download: |
       for annot in tqdm(a['annotations'], desc=f"Converting {set} to YOLOv5 format..."):
           img_id = annot['image_id']
           img_name = a['images'][img_id]['name']
-          img_label_name = img_name[:-3] + "txt"
+          img_label_name = f'{img_name[:-3]}txt'
 
           cls = annot['category_id']  # instance class id
           x_center, y_center, width, height = annot['bbox']