[Helper] Fix Colormap when using HSV to RGB

[fredroy]

it was not noticed in #4270 that the two version of RGB from HSV was different on Hue value
(one is normalized [0...1], the other in RGBAColor is not and is in degree [0...360])

for those interested : http://wiki.gis.com/wiki/index.php/HSV_Color_Space

FYI while debugging, an issue in TetraFEMForcefield has been found #4407

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