Fix typo in postinst script.

debian/postinst

@@ -7,7 +7,7 @@ set -e
 #plugging in a device, and deb-systemd-invoke refuses to start a static service,
 #so force it to start using invoke-rc.d
 
-if [ -d /run/systemd/system ] && [ -z "2" ] && ( [ "$1" = "configure" ] \
+if [ -d /run/systemd/system ] && [ -z "$2" ] && ( [ "$1" = "configure" ] \
 		|| [ "$1" = "abort-remove" ] ) ; then
 	invoke-rc.d g15daemon start >/dev/null || true
 fi