Memory bloat in the app

[zamba96]

Hi, we found an issue with the app that causes a memory bloat. Because we can go infinitely deep into actors, movies and tv show, the back stack can grow indefinitely and this causes the memory usage of the app to also grow indefinitely, until the app resets or an OOM error occurs.

here is a chart of the memory usage showing what I'm talking about:

It gets to 1gb of memory usage