`Surface` has incorrect checkerboard coloring

[BillyLjm]

Description of bug / unexpected behavior

I tried rendering a sphere with manim.Surface, and the checkerboard coloring is not alternating properly.
This is evident in the 2nd and 3rd row above the horizontal plane in the screenshot section below.

Expected behavior

The code should create a spherical surface which each cell having alternating, checkerboard colors.

How to reproduce the issue

Code for reproducing the problem

from manim import *

class ParaSphereDemo(ThreeDScene):
    def construct(self):
        axes = ThreeDAxes()
        sphere = Surface(
            lambda u, v: axes.c2p(
                *np.array([
                    np.sin(u) * np.cos(v),
                    np.sin(u) * np.sin(v),
                    np.cos(u)
                ])
            ),
            u_range=(-np.pi, np.pi),
            v_range=(-np.pi, np.pi),
            checkerboard_colors=False
        )
        self.set_camera_orientation(phi=75 * DEGREES, theta=30 * DEGREES)
        self.add(axes, sphere)

Additional media files

Images/GIFs

Additional comments

I've already fixed this and will submit a PR soon.