Fix max_n for tabular data show_batch function

[brettshollenberger]

Why

show_batch for tabular data doesn't respect the max_n parameter.

Reproduce the error:

import numpy as np
import pandas as pd
from fastai.tabular.all import TabularPandas

df = pd.DataFrame({"A": [1,2,3,4,5,6,7,8,9,10], "ys": np.ones(20)})
tp = TabularPandas(df, cat_names=[], cont_names=["A"], y_names="ys")
dls = tp.dataloaders(bs=5)
dls.show_batch(max_n=3)
 # 5 rows are shown

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