"hide" fired & signal property from trigger class

[mStirner]

In the trigger class, when you fetch scenes, you can see the properties signal & fired.
"Hide" them with enumarble=false.

Example:

        "triggers": [
            {
                "signal": {
                    "_events": {},
                    "_eventsCount": 1
                },
                "fired": null,
                "type": "webhook",
                "params": {
                    "_id": "647c43d8699309d9cb0dd189"
                },
                "_id": "647c4466699309d9cb0dd18f",
                "enabled": true
            }
        ]

To fix this, change in class.trigger.js:

    constructor(obj) {

        //this.signal = new TriggerSignal();
        this.signal = new EventEmitter();
        this.fired = null;

    }

to

    constructor(obj) {

        Object.defineProperty(this, "signal", {
            value: new EventEmitter(),
            writable: false,
            enumerable: false
        });

        Object.defineProperty(this, "fired", {
            value: null,
            writable: true,
            enumerable: false
        });

    }