ProcessorParameterPropertyComp::ParamSlider small bug

If you change the value of a ProcessorParameterPropertyComp::ParamSlider, the plugin-generated text (getParameterText) of the value isn’t up-to-date, because the Slider::Pimpl first updates the text, and then triggers the change-message, which sets the plugin-value, and might change the text.
(Example: If you try to set the slider to “0.” it shows “0.00548” or instead “1.” you see “0.9984” etc.)