[color-slider] When it has `min` || `max` || `value`, the `<prop>change` event is fired too early

[DmitrySharabin]

Consequently, custom listeners defined with on<prop>change attributes are not executing on element initialization.

Testcase

<color-slider space="hsl"
              stops="red, yellow, lime, aqua, blue, magenta, red"
              min="-50" max="50" value="20"
              oncolorchange="this.nextElementSibling.textContent = this.color"></color-slider>
<output></output>

[DmitrySharabin]

Not an issue anymore.