altos: Don't report inhibited pyro channels as fired

altos: Don't report inhibited pyro channels as fired

Inhibiting channels happens when the channel conditions change during
the delay period and was done by marking them as already fired. This
worked, but the log file would then indicate that the channel had
fired when in fact it was inhibited instead. Separate out the inhibited status
so that the correct data appears in the log.

Signed-off-by: Keith Packard <keithp@keithp.com>