As a User, I want to control how long a chat toast appears before it fades. Please add fade time back to Chat preferences.

TEST PLAN:

Open some nearby chat toasts:

1. Ensure that the order in which they are dissapear is correct order (toast that was shown first should be hidden first)

2. Ensure that their fading time and life time correspond to the setting in
chat preferences

3. Try to change fading time and life time from chat settings. Settings should be applied to the new created nearby toasts without viewer restarting.

4. Try to change fading time and life time while some nearby toasts are opened. Settings should be applied to the new created nearby toasts without viewer restarting.