Issue with GeneralizedDiceScore

[nkaenzig]

After merging #640, I get this error when calculating the generalized dice metric:

line 63, in _generalized_dice_update
    intersection = torch.sum(preds * target, dim=reduce_axis)
RuntimeError: The size of tensor a (223) must match the size of tensor b (224) at non-singleton dimension 2

Reproduce:

eva predict_fit --config configs/vision/pathology/offline/segmentation/consep.yaml