testing: Don't run redundant crypto tests in sql/rw-cert scenario

They run in all other rw-cert scenarios but in the SQL version there is
no change in the loaded crypto plugins.

testing/tests/sql/rw-cert/hosts/moon/etc/strongswan.conf

@@ -9,7 +9,4 @@ charon {
   load = test-vectors aes des sha1 sha2 md5 pem pkcs1 gmp random nonce x509 curl revocation hmac stroke kernel-netlink socket-default updown sqlite sql
 
   integrity_test = yes
-  crypto_test {
-    on_add = yes
-  }
 }