Remove `try` from NotificationService#build_recipients

After refactoring pipeline_finished to avoid passing `nil` for
current_user, we shouldn't need to use `try` here anymore.

app/services/notification_service.rb

@@ -628,7 +628,7 @@ class NotificationService
     recipients = reject_unsubscribed_users(recipients, target)
     recipients = reject_users_without_access(recipients, target)
 
-    recipients.delete(current_user) if skip_current_user && !current_user.try(:notified_of_own_activity?)
+    recipients.delete(current_user) if skip_current_user && !current_user.notified_of_own_activity?
 
     recipients.uniq
   end