[Fix] Fix ndarray metainfo check in ConcatDataset

[NrealLzx]

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Motivation

Be able to check the metainfo which is one numpy ndarray. #1330

Modification

     if isinstance(self._metainfo[key], np.ndarray) and isinstance(
                        dataset.metainfo[key], np.ndarray):
                    if not np.array_equal(self._metainfo[key],
                                          dataset.metainfo[key]):
                        raise ValueError(
                            f'The meta information of the {i}-th dataset does'
                            'not match meta information of the first dataset')

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repos?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
3. If the modification has potential influence on downstream projects, this PR should be tested with downstream projects, like MMDet or MMCls.
4. The documentation has been modified accordingly, like docstring or example tutorials.

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[OpenMMLab-Assistant-004]

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