app/testpmd: fix missing boolean values in flow command

app/testpmd: fix missing boolean values in flow command

Original implementation lacks the on/off toggle.

This patch shows up as a fix because it has been a popular request ever
since the first DPDK release with the original implementation but was never
addressed.

Fixes: abc3d81aca1b ("app/testpmd: add item raw to flow command")
Cc: stable@dpdk.org
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>