BUG: ValueError: putmask: output array is read-only

[YarShev]

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Reproducible Example

import numpy as np
import modin.pandas as pd

df = pd.DataFrame([[np.nan, 2, np.nan, 0],
                   [3, 4, np.nan, 1],
                   [np.nan, np.nan, np.nan, np.nan],
                   [np.nan, 3, np.nan, 4]],
                  columns=list("ABCD"))

pdf = df._to_pandas()
pdf.fillna(0, inplace=True)
# ValueError: putmask: output array is read-only

Issue Description

The error happens when operating a pandas df.

Expected Behavior

There shouldn't be an issue. The error probably happens after #4778 is merged. We should also check if to_numpy gives no error when operating a numpy array inplace after converting from modin.

cc @anmyachev

Error Logs

Replace this line with the error backtrace (if applicable).

Installed Versions

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