`plotlist!` does not Cycle using SpecAPI

Right now using `plotlist!` does not cycle through color like `lines!` would do.


MWE is attached below. The second `plotlist!` uses a new cycle instead.

```
begin
    f = Figure()
    ax = Axis(f[1, 1])

    plots = [S.Lines(1:4),S.Lines(2:5)]
    plotlist!(plots)

    plots2 = [S.Lines(3:6),]
    plotlist!(plots2)
    f
end
```