[Fix]Fixed the issue where type and by_epoch in loop_cfg exist simult…

[LRJKD]

…aneously during training in solo_r50_fpn_3x_coco configuration, resulting in failure to train.

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Motivation

Fixed the issue where type and by_epoch in loop_cfg exist simultaneously during training in solo_r50_fpn_3x_coco configuration, resulting in failure to train.

Modification

Modified solo_r50_fpn_3x_coco configuration file.

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)

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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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