Fix not being able to report users from playlists chat

[bdach]

Reported internally.

Review with whitespace off strongly recommended.

For context as to why this diff and why didn't it crash, see

osu/osu.Game/Overlays/Chat/DrawableChatUsername.cs

Line 214 in 7690d96

items.Add(new OsuMenuItem(UsersStrings.ReportButtonText, MenuItemType.Destructive, ReportRequested));

osu/osu.Game/Overlays/Chat/ChatLine.cs

Lines 222 to 231 in d796dee

	if (this.FindClosestParent<PopoverContainer>() != null)
	{
	// This guards against cases like in-game chat where there's no available popover container.
	// There may be a future where a global one becomes available, at which point this code may be unnecessary.
	//
	// See:
	// https://github.com/ppy/osu/pull/23698
	// https://github.com/ppy/osu/pull/14554
	drawableUsername.ReportRequested = this.ShowPopover;
	}