Fix tls12_check_peer_sigalg() for dtls 1.3 #106

Job	Run time
run-checker (no-cmp)	1m 10s
run-checker (no-cms)	1m 10s
run-checker (no-dgram)	1m 17s
run-checker (no-dh)	1m 16s
run-checker (no-dtls)	1m 13s
run-checker (no-ec)	1m 11s
run-checker (no-ec2m)	1m 21s
run-checker (no-ecx)	1m 14s
run-checker (no-http)	1m 20s
run-checker (no-legacy)	1m 13s
run-checker (no-sock)	1m 15s
run-checker (enable-ssl-trace)	3m 10s
run-checker (no-threads)	1m 26s
run-checker (no-thread-pool)	1m 25s
run-checker (no-default-thread-pool)	1m 20s
run-checker (no-tls)	1m 18s
run-checker (no-tls1_2)	1m 23s
run-checker (no-tls1_3)	1m 21s
run-checker (enable-trace enable-fips)	1m 16s
run-checker (no-ui)	1m 12s
run-checker (no-quic)	1m 21s
	28m 52s

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