Online not firing on iOS

Online event isn't firing on iOS.

Environment:
iOS iPhone 5 emulator. iOS version: 10.3.1
Also tried same thing on iOS iPhone 6s emulator with iOS 11.4
On physical iPhone 5 with iOS 11.4.1 everything seems to work. Does the plugin have problems in the emulator?

cordova platforms iOS 4.5.5

Steps to repeat:
cordova create test
cordova platforms add ios@latest
Add this to index.js:

```
onDeviceReady: function() {
this.receivedEvent('deviceready');

document.addEventListener("online", () => {
console.log("ONLINE")
}, false);
document.addEventListener("offline", () => {
console.log("OFFLINE")
}, false);
},
```

On the machine running the emulator turn off all network access.
>> At this point "OFFLINE" prints (good!)

Turn on network access on the computer running the emulator.
>> Expect to see "ONLINE" but I see nothing.

Start with the minimal reproduction in index.js and run it on the listed iOS emulator versions using the stated network-off and network-on steps. Compare the emulator behavior with the physical iPhone result and inspect the plugin's iOS event handling. Done means determining whether the online event should fire after connectivity returns and documenting or correcting the behavior.

Written by the indexing model from the issue text.