fff-hoods: Replace hiddenapflag by check for real conditions

Instead of using the hiddenapflag file, we can just check whether
the hood file copy used by the webserver is present. As a second
condition, we check whether the w2configap is not configured yet.

This fixes the following minor issue:
Previously, if configurehood has run once, the hiddenapflag was
set, but the configap not set up yet. If then a restart happens,
the flag is gone (/tmp), but not recreated until a change in the
hood file appears. Thus, no configap would be set up until that
point.
Since we check for a real condition now, this can't be happening.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Tim Niemeyer <tim@tn-x.org>