bug(background-mode): Promise callbacks never fired.

[ramoncarreras]

Hi,
I'm using @ionic-native/background-mode@3.6.1.

If I execute the following code, console does not show any log.

let bkgmodeConfig: BackgroundModeConfiguration = {
    title: this.translateService.instant("app.background-mode.notification-title"),
    text: this.translateService.instant("app.background-mode.notification-message"),
    color: "000000" ,
    icon: "icon"
};

this.backgroundMode.setDefaults(bkgmodeConfig).then(
    () => {
        console.log('[backgroundMode] setDefaults success');
    },
    () => {
        console.error("[backgroundMode] setDefaults error");
    }
);
this.backgroundMode.configure(bkgmodeConfig).then(
    () => {
       console.log('[backgroundMode] configure success');
    },
    () => {
        console.error("[backgroundMode] configure error");
    }
);

My system information:

Cordova CLI: 6.5.0
Ionic Framework Version: 2.2.0
Ionic CLI Version: 2.2.1
Ionic App Lib Version: 2.2.0
Ionic App Scripts Version: 1.1.4
ios-deploy version: 1.9.0
ios-sim version: 5.0.11
OS: macOS Sierra
Node Version: v7.1.0
Xcode version: Xcode 8.3.2 Build version 8E2002