dont inject non-dom properties
Fixes the ci warnings like:
Warning: React does not recognize the `incIcon` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `incicon` instead. If you accidentally passed it from a parent component, remove it from the DOM element.
in input (created by FormControl)
in FormControl (at NumericStep.jsx:40)
in ForwardRef (at MotorDefault.jsx:225)
Edited by Stuart Fisher