ptxed: fix default decoder help text

We switched the default decoder to the block decoder, yet the help text
still claims that the instruction decoder is default.

Fix the help text.

Reported-by: Tamas Lengyel <tamas.lengyel@intel.com>
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
1 file changed