runfix: assign correct background color to emoji picker's input

[V-Gira]

Description

The emoji picker's input stopped using our custom background color in dark mode after a change in the library

Screenshots/Screencast (for UI changes)

Before:

After:

Checklist

• PR has been self reviewed by the author;
• Hard-to-understand areas of the code have been commented;
• If it is a core feature, unit tests have been added;