Notification message icon's background stays white in night mode

[madhurgupta10]

Summary:
The notification message icon's background stays white in night mode.

Steps to reproduce:
Open the notifications with night mode enabled.

Device and Android version:
Android 10 API Level 29 Google Pixel 2

Commons app version:
2.12.3 beta-master

Screen-shots:

Would you like to work on the issue?
Yes, I already have a PR for this.