masakhaner dataset load problem
## Describe the bug
Masakhaner dataset is not loading

## Steps to reproduce the bug
```
from datasets import load_dataset
dataset = load_dataset("masakhaner",'amh')
```

## Expected results
Expected the return of a dataset

## Actual results

```

NonMatchingSplitsSizesError               Traceback (most recent call last)
<ipython-input-3-a6abc1161d4c> in <module>()
      1 from datasets import load_dataset
      2 
----> 3 dataset = load_dataset("masakhaner",'amh')



3 frames
/usr/local/lib/python3.7/dist-packages/datasets/utils/info_utils.py
 in verify_splits(expected_splits, recorded_splits)
     72     ]
     73     if len(bad_splits) > 0:
---> 74         raise NonMatchingSplitsSizesError(str(bad_splits))
     75     logger.info("All the splits matched successfully.")
     76 

NonMatchingSplitsSizesError: [{'expected': SplitInfo(name='train', num_bytes=639927, num_examples=1751, dataset_name='masakhaner'), 'recorded': SplitInfo(name='train', num_bytes=639911, num_examples=1750, dataset_name='masakhaner')}, {'expected': SplitInfo(name='validation', num_bytes=92768, num_examples=251, dataset_name='masakhaner'), 'recorded': SplitInfo(name='validation', num_bytes=92753, num_examples=250, dataset_name='masakhaner')}, {'expected': SplitInfo(name='test', num_bytes=184286, num_examples=501, dataset_name='masakhaner'), 'recorded': SplitInfo(name='test', num_bytes=184271, num_examples=500, dataset_name='masakhaner')}]
```

## Environment info
Google Colab

Thanks for reporting, @ontocord. We are fixing the wrong metadata.