The taiko-slider is not included in `Playfield`, so it doesn't get hidden when calling `drawableRuleSet.Playfield.Hide()`. Calling `drawableRuleSet.Hide()` hides the taiko-slider, in addition to the rest of the `Playfield`.
Three bindables are left which don't have this overriden due to them
already not having a value-only constructor and not supporting
`GetBoundCopy()` properly:
- `BeatmapDifficultyCache.BindableStarDifficulty`.
- `TotalScoreBindable`
- `TotalScoreStringBindable`
I could add support for them by passing the required data to them, as
they seem to be able to have that shared, but I'm hesitant to support
something which was already broken and never used, not sure.
This was causing any `ValueChanged` event bind (such as the one in
`SettingsItem` to invoke `SettingsChanged`) to be overwritten when
`Current` is set afterwards.