[tests][python] Make test that checks original pandas data isn't modified more strict (#5267)
[tests][python] Make test that checks original pandas data isn't modified more strict (#5267)

* Update test_basic.py

* Address review comment
microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,microsoft/LightGBM,henry0312/LightGBM,henry0312/LightGBM,microsoft/LightGBM,microsoft/LightGBM,henry0312/LightGBM