use alreadyRegisteredForNotification instead of defaultProxyConfig?.pushNotificationAllowed to fix double calls

Classes/CallManager.swift

@@ -43,6 +43,7 @@ import AVFoundation
 	@objc var speakerEnabled : Bool = false
 	@objc var bluetoothEnabled : Bool = false
 	@objc var nextCallIsTransfer: Bool = false
+	@objc var alreadyRegisteredForNotification: Bool = false
 
 
 	fileprivate override init() {
@@ -393,7 +394,7 @@ class CoreManagerDelegate: CoreDelegate {
 							// The call is already answered.
 							CallManager.instance().acceptCall(call: call, hasVideo: video)
 						}
-					} else if (!(lc.defaultProxyConfig?.pushNotificationAllowed ?? false)) {
+					} else if (!CallManager.instance().alreadyRegisteredForNotification) {
 						CallManager.instance().displayIncomingCall(call: call, handle: address, hasVideo: video, callId: callId!)
 					}
 				} else if (UIApplication.shared.applicationState != .active) {

Classes/LinphoneAppDelegate.h

@@ -40,7 +40,6 @@
 @property (nonatomic, retain) NSString *configURL;
 @property (nonatomic, strong) UIWindow* window;
 @property PKPushRegistry* voipRegistry;
-@property BOOL alreadyRegisteredForNotification;
 @property BOOL onlyPortrait;
 @property UIApplicationShortcutItem *shortcutItem;
 

Classes/LinphoneAppDelegate.m

@@ -47,7 +47,7 @@
 	if (self != nil) {
 		startedInBackground = FALSE;
 	}
-	_alreadyRegisteredForNotification = false;
+	CallManager.instance.alreadyRegisteredForNotification = false;
     _onlyPortrait = FALSE;
 	return self;
 	[[UIApplication sharedApplication] setDelegate:self];
@@ -152,10 +152,10 @@
 #pragma deploymate push "ignored-api-availability"
 
 - (void)registerForNotifications {
-	if (_alreadyRegisteredForNotification)
+	if (CallManager.instance.alreadyRegisteredForNotification)
 		return;
 
-	_alreadyRegisteredForNotification = true;
+	CallManager.instance.alreadyRegisteredForNotification = true;
 	self.voipRegistry = [[PKPushRegistry alloc] initWithQueue:dispatch_get_main_queue()];
 	self.voipRegistry.delegate = self;