Change indicator icon is not visible in Pass-the-mic game mode

[RenBabiuch]

Description:
In pass-the-mic game mode, there should be change-indicator-icon displayed, which sygnalize, that player should pass the mic to the other player. Unfortunately, that icon is invisible.

Steps to reproduce:

1. Run Sing a duet song in pass-the-mic mode as a single connected player test in duet-song.spec.ts file
   a) Icon should be displayed in step: Pass the mic progress and change indicator icon should be displayed