Update speedrun script to load speedrun_results.json from folder depth > 1 (#3079)

Simple 4 line update to load speedrun_results.json files that aren't
just at root level in experiments/speedrun/x/.
From testing localing, this should pick up ~100 runs from others.

Author: ClassicLarry

lib/marin/src/marin/speedrun/create_leaderboard.py

@@ -66,9 +66,13 @@ class LeaderboardEntry:
 
 
 def find_speedrun_results(base_path: str) -> list[str]:
-    fs = fsspec.filesystem(base_path.split("://", 1)[0] if "://" in base_path else "file")
-    pattern = f"{base_path}/**/speedrun_results.json"
-    all_results = fs.glob(pattern)
+    if "://" in base_path:
+        fs = fsspec.filesystem(base_path.split("://", 1)[0])
+        pattern = f"{base_path}/**/speedrun_results.json"
+        all_results = fs.glob(pattern)
+    else:
+        # fsspec's local glob doesn't recurse with **, so use pathlib instead.
+        all_results = [str(p) for p in Path(base_path).glob("**/speedrun_results.json")]
 
     # Filter out excluded speedruns by checking the run name (directory name)
     return [path for path in all_results if Path(path).parent.name not in EXCLUDED_SPEEDRUNS]