Fix: `tests/ctf-traces/succeed` traces: change CTF version from 0.1 to to 1.8

This version of CTF, 0.1, never really existed. Also, the first lines of
the `metadata` files changed by this patch already contain `CTF 1.8`,
indicating that this is a bug in the `trace` block.

Somehow Babeltrace 1 is less strict than Babeltrace 2 and accepts those
traces. We take the deliberate decision to refuse them.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>