"I was given an opportunity to lead a product I was very excited about, and I took it. It was a great experience, and I learned a lot, but ultimately now I'm glad to be moving back into a developer role."

If you can truthfully say that, you're conveying not indecision, but rather showing the flow of your career path. That is something that is expected to take a few twists like this, and that's even a sign that you're someone with flexibility and a variety of skills, as opposed to being inflexible and unwilling to do things that are "outside the box".