LibNGAP_Templates: Fix criticality of PLMNSupportList IE in NGSetupResponse

The criticality rejected is specified in 3GPP TS 38.413 version 18.5.0
Release 18, both in the ASN.1 definition of "NGSetupResponseIEs NGAP-PROTOCOL-IES",
as well as section 9.2.6.2.
open5gs-amfd is correctly sending reject there.