[UI] Spectating, rewinding while nexus destruction animation is playing causes minimap to disappear

When spectating a game, attempting to rewind the game while the nexus destruction animation is playing causes the minimap to disappear.

1. Spectate a game of Summoner's Rift.
2. Wait until the game is over.
3. As the nexus destruction animation is playing, and the camera pans, rewind the game to a point before the nexus has been destroyed.
4. Observe that the minimap and its functionality has disappeared from the UI indefinitely.