Fix a tiny bug when converting from VOC to coco

[pminimd]

When there exists an annotation_id which holds one or more SPACE inside, it will be incorrectly split and the last segment taken out as an unseen annotation_id. Which leads to the following FileNotFoundError

  3%|█████▏                                                                                                                                               | 2/58 [00:00<00:00, 12464.50it/s]
Traceback (most recent call last):
  File "tools/x2coco.py", line 542, in <module>
    main()
  File "tools/x2coco.py", line 431, in main
    voc_xmls_to_cocojson(
  File "tools/x2coco.py", line 262, in voc_xmls_to_cocojson
    ann_tree = ET.parse(a_path)
  File "/home/pminimd/miniconda3/envs/kfxd/lib/python3.8/xml/etree/ElementTree.py", line 1202, in parse
    tree.parse(source, parser)
  File "/home/pminimd/miniconda3/envs/kfxd/lib/python3.8/xml/etree/ElementTree.py", line 584, in parse
    source = open(source, "rb")
FileNotFoundError: [Errno 2] No such file or directory: '/home/pminimd/dataset/Hand_Det/Annotations/hand```

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