Tone EQ: merge advanced and masking tabs

[pedrorrodriguez]

Using this module is cumbersome because functionality that should be together is separated into advanced and masking tabs. I suggest we merge them and get rid of the grey bar indicator in the masking tab.

Also, is there a use case for the simple view? If not, perhaps it can be removed as well.

EDIT: there is, since it's the only way to bind node adjustment to keyboard shortcuts.

[AlynxZhou]

I personally uses advanced tab everyday.

[pedrorrodriguez]

Also, perhaps the curve smoothing can be adjusted via scrollwheel on the graph (like denoise profiled and contrast equalizer) instead of via dedicated slider

[wilecoyote2015]

I strongly agree with this request.
Due to the different ranges of individual images, I have to switch between the tabs for almost every image.
Further consideration: Tuning of t maks postprocessing parameters would be significantly simpler if the historgram in the graph could be seen, which would be a nice side effect of merging the tabs

[aurelienpierre]

Done