Top bar color and message pan color values should change when theme is changed to light/dark.

[neeraj3029]

Actual Behaviour
Presently, when theme is changed to light/dark from a custom theme, the value of colors of top bar and message pane do not change to light/dark accordingly.

Expected Behaviour
the value of colors of top bar and message pane should change to light/dark with change in theme.

Steps to reproduce it
Try changing the theme to light/dark from a custom one.

Screenshots of the issue
GIF-

Would you like to work on the issue?
Yes