[BUG] Color sliders cannot equal 1.0 if other color slider is already that value

[rpaladin]

Disclaimer: I'm not sure if this issue is actually caused by Armory2D or Armory UI, so feel free to move this issue to that repository if need be.

How to reproduce the issue:

1. Open an Armory Canvas in the Armory2D Editor.
2. Select an element that supports color.
3. Enter 1.0 for one of the R.G.B color sliders.
4. Then attempt to set any of the other color slides to equal 1.0 too, either by click-dragging the slider or by manually inputting the value.

The expected buggy behavior is that any other colors cannot equal 1.0 if there is at least 1 other color slider value already set to that value.

The alpha slider works fine though.

Special thanks to @ knowledgenude for confirming the issue too.

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Issue possibly related to: armory3d/zui#159