Osu: Add avatar to results screen

[smileyhead]

Describe the new feature: It would make sense, since the player's name and cover are already displayed and there's an empty space above the name.

Proposal designs of the feature:

[frenzibyte]

I believe results screen will have a new design very soon, no need to modify current design for now.

[timrowland-wq]

This should be closed by #8311

[Joehuu]

Resolved in #8311.