[IOS] Notification not shown when the app is in foreground state

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**Describe the bug**

Notification did not shown when the app is in foreground state on IOS

**To Reproduce**
Here is the code i use, i am setting all present option to true, but the notification did not show up. it's only showing up when the app is minimized.
```dart
await flutterLocalNotificationsPlugin.show(
99,
'title'
'notification body',
NotificationDetails(
android: AndroidNotificationDetails(),
iOS: DarwinNotificationDetails(
sound: "adzan.aiff",
interruptionLevel: InterruptionLevel.timeSensitive,
presentSound: true,
presentList: true,
presentAlert: true,
presentBadge: true,
presentBanner: true,
)
),
);
```
**Expected behavior**

As stated on readme, default behavior for IOS is to show notification even on foreground. But even after setting the presentation option to true it didn't show up.

> For iOS 10+, use the presentation options to control the behaviour for when a notification is triggered while the app is in the foreground. The default settings of the plugin will configure these such that a notification will be displayed when the app is in the foreground.

**Sample code to reproduce the problem**

```dart
/// initialization part
final InitializationSettings initializationSettings = InitializationSettings(,
iOS: DarwinInitializationSettings(
defaultPresentAlert: true,
defaultPresentBadge: true,
defaultPresentBanner: true,
defaultPresentSound: true,
onDidReceiveLocalNotification: (int id, String? title, String? body, String? payload){
print([id, title, body, payload]);
},
defaultPresentList: true
)
);
await flutterLocalNotificationsPlugin.initialize(
initializationSettings,
onDidReceiveNotificationResponse: (response){
print(["onDidReceiveNotificationResponse", response.actionId]);
},
onDidReceiveBackgroundNotificationResponse: notificationTapBackground,
);

/// Calling notification part
await flutterLocalNotificationsPlugin.show(
99,
'title'
'notification body',
NotificationDetails(
android: AndroidNotificationDetails(),
iOS: DarwinNotificationDetails(
sound: "adzan.aiff",
interruptionLevel: InterruptionLevel.timeSensitive,
presentSound: true,
presentList: true,
presentAlert: true,
presentBadge: true,
presentBanner: true,
)
),
);
```

Start with the README's iOS foreground-notification guidance and the example app, then reproduce the supplied initialization and show sequence on iOS. Compare the default presentation settings with the explicit DarwinNotificationDetails options; done means the notification is displayed while the app is foregrounded as documented.

Written by the indexing model from the issue text.