nut: Reduce user error with POWERDOWNFLAG

Instead of making POWERDOWNFLAG an uci option the user can
only change it via initscript edits.  This avoids chance for users
to miss the required change to nut-driver when setting an UCI option
for nut-monitor which results in failure to do FSD on the UPS.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

net/nut/files/nut-monitor.init

@@ -35,8 +35,7 @@ nut_upsmon_conf() {
 	config_get val "$cfg" deadtime 15
 	echo "DEADTIME $val" >> $UPSMON_C
 
-	config_get val "$cfg" powerdownflag /var/run/killpower
-	echo "POWERDOWNFLAG $val" >> $UPSMON_C
+	echo "POWERDOWNFLAG /var/run/killpower" >> $UPSMON_C
 
 	config_get val "$cfg" onlinemsg
 	[ -n "$val" ] && echo "NOTIFYMSG ONLINE \"$val\"" >> $UPSMON_C

net/nut/files/nut_monitor

@@ -8,7 +8,6 @@
 #	option pollfreqalert 5
 # 	option hostsync 15
 #	option deadtime 15
-#	option powerdownflags /var/run/killpower
 #	option onlinemsg "online message"
 #	option onbattmsg "on battery message"
 #	option lowbattmsg "low battery message"