ssl-opt.sh: fix typo in mtu settings
@@ -5964,7 +5964,7 @@ run_test "DTLS fragmenting: both (MTU=1024)" \
crt_file=data_files/server7_int-ca.crt \
key_file=data_files/server7.key \
hs_timeout=2500-60000 \
- mtu=512" \
+ mtu=1024" \
"$P_CLI dtls=1 debug_level=2 \
crt_file=data_files/server8_int-ca2.crt \
key_file=data_files/server8.key \
