pimd: fix reversed logic for "debug ... detail"

pimd: fix reversed logic for "debug ... detail"

The normal flag was enabling detail messages, but what we want is the
detail flag enabling normal messages.

Remove the _ONLY macro while at it, it's only used for config print &
that seems like a place where making the difference explicitly visible
is helpful regardless.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>