[AC-2869] Calling removeEventListener on Geolocation event prevents addEventListener from working

Ti.Geolocation.preferredProvider 				=  	Ti.Geolocation.PROVIDER_GPS;
Ti.Geolocation.accuracy 					= 	Titanium.Geolocation.ACCURACY_HIGH;
Ti.Geolocation.purpose 						= 	'Determine Position';
Ti.Geolocation.headingFilter 					= 	5;
Ti.Geolocation.showCalibration 					= 	true;
Ti.Geolocation.distanceFilter					=	10;

	
var win1 = Titanium.UI.createWindow({  
    backgroundColor:'#fff'
});

var btnAdd = Ti.UI.createButton({
	top: 100,
	title: 'Add Event Listener',
})

btnAdd.addEventListener('click', addGeoEvent);

var btnRemove = Ti.UI.createButton({
	top:	200,
	title: 'Remove Event Listener',
})

btnRemove.addEventListener('click', removeGeoEvent);

win1.add(btnAdd);
win1.add(btnRemove);

function addGeoEvent(){
	Ti.API.info('adding listener');
	Ti.Geolocation.addEventListener('heading', headingCallback);
}

function removeGeoEvent(){
	Ti.API.info('removing listener');
	Ti.Geolocation.removeEventListener('heading', headingCallback);
}

function headingCallback(e){
	
	Ti.API.info('heading = ' + e.heading.magneticHeading);
	
}

win1.open();