[Fix] Remove dependcy mmdet when do not use `MaskFormerHead` and `MMDET_Mask2FormerHead` (#2448)
## Motivation Calling `mmseg.utils.register_all_modules` will import `MaskFormerHead` and `Mask2FormerHead`, it will crash if mmdet is not installed as `None` cannot be initialized. ## Modification - Modify `MMDET_MaskFormerHead=BaseModule` and `MMDET_Mask2FormerHead = BaseModule` when cannot import from mmdet
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