1280 out features

https://github.com/leaderj1001/MobileNetV3-Pytorch/blob/2cf3efa64d00c45e9ac61c3ef362396e9700fdb8/model.py#L229

According to the paper in the 'small' model they use 1024 as an output features unlike the 'large' one where it is in deed 1280.