[#87369450] Always insert iframe JS
[#87369450] Always insert iframe JS

- incase the script runs between page loads
- uses js to check if iframe bridge already exists
digitalscientists/cordova-plugin-inappbrowser,digitalscientists/cordova-plugin-inappbrowser,digitalscientists/cordova-plugin-inappbrowser,digitalscientists/cordova-plugin-inappbrowser