hooks/fancy: fix checking for falling edge, revert of 12c10e57d48a18e4a72625f217219d8dc900e48b.

Pushing handle_output_{create,destroy} to print_stack_{push,pop} is not
the way to do it, as it conflicts with reordering done in
6af0b65f848934049d22fb2c8a1c2b4b18ae2ecc.

Instead, just revert and add an ugly but functional check.