tsdemux: Disable smart program update

The goal of this code was, for programs which were updates (i.e. adding/removing streams but not completely changing) to allow dynamic addition/removal of streams without completely removing everything if in a streams-aware bin.

But this wasn't 100% tested and there are a bunch of issues which make it fail in plenty of ways.

For now disable that feature and force the legacy "add all pads again and then remove old ones" behaviour to make it switch.