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.
`DifficultyAdjustSettingsControl` and its inner `SliderControl` were
holding different references to `DifficultyBindable`s from the
difficulty adjust mod, therefore leading to bindings being lost to the
framework-side automatic unbind logic if the mod was toggled off and
back on in rapid succession.
Resolve by adding a shadowed implementation of `GetBoundCopy()` and
using it to isolate the controls from the mod bindable.
