[Cin] Chromakey improvements checked in to GIT

[Phyllis Smith]

This is consistent behavior with other plugins.  For example Sharpen,
Linear Blur, Wave, Radial Blur.

> Instead, an important thing that I had noticed even before trying
> wayland, but forgot to report in the previous email is that the
> “Default” button returns the threshold to 10, as required. In
> contrast, the “Reset” button on the slider brings it back to 0. This
> difference can also be seen in chromakey.C :
>
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