pptpd: run service in foreground for procd compatibility

To have service working nicely with procd it should be running in the
foreground. Otherwise it's not possible to e.g. stop it with the init.d
script. Luckily for us pptpd has a simple switch that allows it.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Fixes: 15e7f611af ("pptpd: convert init script to procd")

net/pptpd/files/pptpd.init

@@ -67,6 +67,6 @@ start_service() {
 	ln -sfn $CHAP_SECRETS /etc/ppp/chap-secrets
 
 	procd_open_instance
-	procd_set_param command $BIN -c $CONFIG -o $OPTIONS_PPTP
+	procd_set_param command $BIN -c $CONFIG --fg -o $OPTIONS_PPTP
 	procd_close_instance
 }