Fix notification prompt callback firing w/ focus

Fix bug where the callback passed to promptForPushNotifications would fire false if there was a foreground event being processes by the SDK. This would happen in the following case: 1. if you prompted but the user backgrounded and foregrounded the app before answering the prompt. 2. If promptForPushNotifications was called before the SDK detected the app was foregrounded.

Author: jkasten2

OneSignalSDK/onesignal/src/main/java/com/onesignal/NotificationPermissionController.kt

@@ -36,6 +36,7 @@ object NotificationPermissionController : PermissionsActivity.PermissionCallback
 
  private val callbacks:
  MutableSet<OneSignal.PromptForPushNotificationPermissionResponseHandler> = HashSet()
+ private var awaitingForReturnFromSystemSettings = false
 
  init {
  PermissionsActivity.registerAsCallback(PERMISSION_TYPE, this)
@@ -97,6 +98,7 @@ object NotificationPermissionController : PermissionsActivity.PermissionCallback
  object : AlertDialogPrepromptForAndroidSettings.Callback {
  override fun onAccept() {
  NavigateToAndroidSettingsForNotifications.show(activity)
+ awaitingForReturnFromSystemSettings = true
  }
  override fun onDecline() {
  fireCallBacks(false)
@@ -113,6 +115,8 @@ object NotificationPermissionController : PermissionsActivity.PermissionCallback
  }
 
  fun onAppForegrounded() {
+ if (!awaitingForReturnFromSystemSettings) return
+ awaitingForReturnFromSystemSettings = false
  fireCallBacks(notificationsEnabled())
  }