applications/luci-dump1090: fix disabling service instance

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
applications/luci-udpxy: fix disabling service instance

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
applications/luci-shairplay: fix disabling service instance

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
applications/luci-shairport: fix disabling service instance

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>