fix auto resubscribe for macOS Safari

Fixed by using existing Safari push token if available. Attempting to
prompt when permission is already granted still throws with user gesture
required error other wise.

src/shared/managers/SubscriptionManager.ts

@@ -401,23 +401,29 @@ export class SubscriptionManager {
 
     const { deviceToken: existingDeviceToken } =
       window.safari.pushNotification.permission(this.config.safariWebId);
-    if (!existingDeviceToken) {
-      /*
-        We're about to show the Safari native permission request. It can fail for a number of
-        reasons, e.g.:
-          - Setup-related reasons when developers just starting to get set up
-            - Address bar URL doesn't match safari certificate allowed origins (case-sensitive)
-            - Safari web ID doesn't match provided web ID
-            - Browsing in a Safari private window
-            - Bad icon DPI
-
-        but shouldn't fail for sites that have already gotten Safari working.
-
-        We'll show the permissionPromptDisplay event if the Safari user isn't already subscribed,
-        otherwise an already subscribed Safari user would not see the permission request again.
-       */
-      OneSignalEvent.trigger(OneSignal.EVENTS.PERMISSION_PROMPT_DISPLAYED);
+
+    if (existingDeviceToken) {
+      pushSubscriptionDetails.setFromSafariSubscription(
+        existingDeviceToken.toLowerCase(),
+      );
+      return pushSubscriptionDetails;
     }
+
+    /*
+      We're about to show the Safari native permission request. It can fail for a number of
+      reasons, e.g.:
+        - Setup-related reasons when developers just starting to get set up
+          - Address bar URL doesn't match safari certificate allowed origins (case-sensitive)
+          - Safari web ID doesn't match provided web ID
+          - Browsing in a Safari private window
+          - Bad icon DPI
+
+      but shouldn't fail for sites that have already gotten Safari working.
+
+      We'll show the permissionPromptDisplay event if the Safari user isn't already subscribed,
+      otherwise an already subscribed Safari user would not see the permission request again.
+    */
+    OneSignalEvent.trigger(OneSignal.EVENTS.PERMISSION_PROMPT_DISPLAYED);
     const deviceToken = await this.subscribeSafariPromptPermission();
     PermissionUtils.triggerNotificationPermissionChanged();
     if (deviceToken) {