Remove unnecessary didRegisterUserNotificationSettings implementation, which did break cordova-local-notifications-plugin as a side effect

src/ios/AppDelegate+notification.h

@@ -13,7 +13,6 @@
 - (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error;
 - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo;
 - (void)applicationDidBecomeActive:(UIApplication *)application;
-- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings;
 - (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler;
 - (id) getCommandInstance:(NSString*)className;
 

src/ios/AppDelegate+notification.m

@@ -98,12 +98,6 @@ - (void)applicationDidBecomeActive:(UIApplication *)application {
     }
 }
 
-- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings
-{
-    //register to receive notifications
-    [application registerForRemoteNotifications];
-}
-
 //For interactive notification only
 - (void)application:(UIApplication *)application handleActionWithIdentifier:(NSString *)identifier forRemoteNotification:(NSDictionary *)userInfo completionHandler:(void(^)())completionHandler
 {

src/ios/PushPlugin.m

@@ -117,6 +117,10 @@ - (void)init:(CDVInvokedUrlCommand*)command;
 }
 
 - (void)didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
+    if (self.callbackId == nil) {
+        NSLog(@"Unexpected call to didRegisterForRemoteNotificationsWithDeviceToken, ignoring: %@", deviceToken);
+        return;
+    }
     NSLog(@"Push Plugin register success: %@", deviceToken);
 
     NSMutableDictionary *results = [NSMutableDictionary dictionary];
@@ -180,6 +184,10 @@ - (void)didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
 
 - (void)didFailToRegisterForRemoteNotificationsWithError:(NSError *)error
 {
+    if (self.callbackId == nil) {
+        NSLog(@"Unexpected call to didFailToRegisterForRemoteNotificationsWithError, ignoring: %@", error);
+        return;
+    }
     NSLog(@"Push Plugin register failed");
     [self failWithMessage:@"" withError:error];
 }