Using "UIModalPresentationStyle.Popover" for showModal causes the closeCallback to not be called #7050

Environment
Provide version numbers for the following components (information can be retrieved by running tns info in your project folder or by inspecting the package.json of the project):

• CLI: 5.2.0
• Cross-platform modules: 5.3.0-next-2019-03-21-142557-02
• Android Runtime:
• iOS Runtime: 5.3.0-2019-03-21-073518-01
• Plugin(s):

Describe the bug
When setting the presentationStyle of the ShowModalOptions to Popover:

ios: {
    presentationStyle: UIModalPresentationStyle.Popover
}

the closeCallback of the ShowModalOptions is never called if you tap outside of the modal view to close it.

To Reproduce

1. add the tns-platform-declarations to devDependencies: npm i tns-platform-declarations --save-dev
2. Add references.d.ts to the root of the 'modal-navigation' e2e app with the following content:
   /// <reference path="./node_modules/tns-platform-declarations/ios.d.ts" />
3. Change this lines of the 'modal-navigation' e2e app to:

let options: ShowModalOptions = {
    context: "context",
    closeCallback: () => console.log("home-page modal page closed"),
    fullscreen: true,
    ios: {
        presentationStyle: UIModalPresentationStyle.Popover
    },
};
view.showModal(frame, options);

Expected behavior
The closeCallback of the ShowModalOptions is called when you tap outside of the shown modal view in order to close it.