Highlightbackground not adapting to the dynamic bg changes.

[Saadmairaj]

Describe the bug
When re-changing the background colour of the button, Highlightbackground should change to a lighter/darker shade of bg but doesn't change.

To Reproduce

from tkinter import Tk
from tkmacosx import Button

root = Tk()
B0 = Button(root, text='Button', bg='yellow')
B0['bg'] = 'pink'
B0['command'] = lambda: B0.configure(bg="lightgreen")
B0.pack(padx=10, pady=10)
root.mainloop()

Expected behavior
The highlightbackground should change to a lighter/darker shade of bg

• OS: 11.3 big sur
• Version: <=1.0.2

[Saadmairaj]

Feature removed due to its inconsisstency.