Event listener function overloads are too brittle, error if evt is undefined

[jpike88]

The document.addEventListener, document.removeEventListener, window.addEventListener, window.removeEventListener overloads in cordova.js error if the evt variable is undefined. While this is something that also be fixed upstream in the relevant calling code, these functions should not be erroring as that is not the behaviour of what they are overloading.

window.addEventListener(undefined, () => {})

In cordova.js, the above would cause an error.
In safari/chrome console, no error is triggered.

I have create a PR to address this.
#245

Related:
ionic-team/capacitor#4178
mapbox/mapbox-gl-js#11433

[alexculea]

Adding to this, passing an Event instance instead of a string will also throw an exception when trying to get it converted to a lower case string as for example here:

cordova-js/src/cordova.js

Line 47 in 7c2f830

var e = evt.toLowerCase();