PaperUI | DecimalType is parsed to Integer

[walwe]

I noticed that the Paper UI no longer displays decimals places.
This bug was introduced in #2628:
The PR added the handling of the statechanged event, but it ignores the fact, that the statechangedevent is not unique to the Rollershutter type and therefore parsing all DecimalType and PercentType using parseInt.

Please correct me if i am wrong, but I do not see a real use case for the statechanged event and therefore would simply delete the event listener, thus preventing it from overwriting the state properly handled by the state event.

[kaikreuzer]

@aounhaider1, Could you please check?