cordova-plugin-googlemaps: Back button event conflict with registerBackButtonAction()

I’m submitting a … (check one with “x”) [ ] question [x] any problem or bug report [ ] feature request

plugin version: (check one with “x”) [ ] 1.4.x [x] 2.0.0-beta3

cordova information: (run $> cordova plugin list)

cordova-plugin-console 1.0.5 "Console"
cordova-plugin-device 1.1.4 "Device"
cordova-plugin-googlemaps 2.0.0-beta3-20170811-1937 "cordova-plugin-googlemaps"
cordova-plugin-splashscreen 4.0.3 "Splashscreen"
cordova-plugin-statusbar 2.2.2 "StatusBar"
cordova-plugin-whitelist 1.3.1 "Whitelist"
ionic-plugin-keyboard 2.2.1 "Keyboard"

Current behavior:

If you add the googlemaps plugin, registerBackButtonAction() will not be respected; application will exit regardless.’

Expected behavior: App should continue to respect registerBackButtonAction(), and allow control of hardware back button.

Steps to reproduce:

1. Load project from https://github.com/ryanhalley/hardwarebackbutton
2. Run ‘cordova run android -cl’ and press hardware Back button on Android device; exit dialog should appear.
3. Run: ionic cordova plugin add https://github.com/mapsplugin/cordova-plugin-googlemaps#multiple_maps --variable API_KEY_FOR_ANDROID=“YOUR_ANDROID_API_KEY_IS_HERE” --variable API_KEY_FOR_IOS=“YOUR_IOS_API_KEY_IS_HERE”
4. Run ‘cordova run android -cl’, press Back button; app will close.

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