add runs url in missing ds configs (#2060)

Author: mikel-brostrom

boxmot/configs/datasets/MOT20-ablation.yaml

@@ -1,5 +1,6 @@
 # https://motchallenge.net/data/MOT20/
 download:
+  runs_url: null
   dataset_url: "https://github.com/mikel-brostrom/boxmot/releases/download/v13.0.9/MOT20-ablation.zip"
   dataset_dest: "boxmot/engine/trackeval/MOT20-ablation.zip"
 

boxmot/configs/datasets/dancetrack-ablation.yaml

@@ -1,5 +1,6 @@
 # https://huggingface.co/datasets/noahcao/dancetrack/tree/main
 download:
+  runs_url: null
   dataset_url: "https://huggingface.co/datasets/noahcao/dancetrack/resolve/main/val.zip?download=true"
   dataset_dest: "boxmot/engine/trackeval/dancetrack-ablation.zip"