Removing a running map on Windows can fail if HTCondor is writing to the log at the same time

This will fail occasionally with something like `PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\joshk\\.htmap\\maps\\foo\\cluster_logs\\253.log'`:

```python
import htmap
htmap.force_clean()

@htmap.htmap
def double(x):
    return 2 * x

result = double.map('foo', range(10))
result.remove()
```