Bug: Incorrect validation logic in plotting.max_rows config option

[RohithPariki]

Description

There is a logic error in the validation function for the plotting.max_rows configuration option that prevents proper validation of negative values.

Location

File: databricks/koalas/config.py
Line: 201

Current Code

Option(
    key="plotting.max_rows",
    doc=(
        "'plotting.max_rows' sets the visual limit on top-n-based plots such as `plot.bar` "
        "and `plot.pie`. If it is set to 1000, the first 1000 data points will be used "
        "for plotting. Default is 1000."
    ),
    default=1000,
    types=int,
    check_func=(
        lambda v: v is v >= 0,  # ← BUG HERE
        "'plotting.max_rows' should be greater than or equal to 0.",
    ),
),