The default chunks of clone_data should be time=1. (#306)

I just verified this and it looks like in the OSN pod, chunks are
`time=1`, but by default, we write `time=10` chunks. I want to remedy
this so we don't make any accidents when automating are testing setup.

Author: alxmrs

scripts/clone_data.py

@@ -95,7 +95,7 @@ def main(args: argparse.Namespace) -> None:
         default=None,
         help="end index for data.isel() along time dimension.",
     )
-    parser.add_argument("--write_time_chunks", type=int, default=10)
+    parser.add_argument("--write_time_chunks", type=int, default=1)
     parser.add_argument("--compact_variables", action="store_true")
     parser.add_argument("--local_cluster", action="store_true")