Fix Timeout Bug

• Fixes an issue where the delegate could get executed twice under some situations when the timeout is reached (if they implement the `OSNotificationDisplayTypeDelegate` but don't ever call the callback, the SDK times out after a while and uses the default display type)

Author: Nightsd01

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -1836,6 +1836,8 @@ + (void)watchdogTimerFired:(NSTimer *)timer {
 
     [_pendingDisplayTypeCallbacks removeObjectForKey:notificationId];
 
+    _displayTypeMap[notificationId] = @(_inFocusDisplayType);
+    
     for (OSNotificationDisplayTypeResponse completion in callbacks)
         completion(_inFocusDisplayType);
 }