Fix wrong size of mask in RTMDet-Ins post-processing.

[flytocc]

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Motivation

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Fix wrong size of mask in rtmdet-ins post-processing. #11230

Modification

Please briefly describe what modification is made in this PR.

            if rescale:
                ori_h, ori_w = img_meta['ori_shape'][:2]
                mask_logits = F.interpolate(
                    mask_logits,
                    size=[
                        math.ceil(mask_logits.shape[-2] * scale_factor[1]),  # modified scale_factor[0] to scale_factor[1]
                        math.ceil(mask_logits.shape[-1] * scale_factor[0])  # modified scale_factor[1] to scale_factor[0]
                    ],
                    mode='bilinear',
                    align_corners=False)[..., :ori_h, :ori_w]

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 MMPreTrain.
4. The documentation has been modified accordingly, like docstring or example tutorials.

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