Incorrectly using verifier_type as argument to rtls_verifier_select()

[Kun Lai]

The function rtls_verifier_select() need a verifier name str but verifier type str is provided currently.

rats-tls/src/tls_wrappers/api/tls_wrapper_verify_certificate_extension.c

Line 42 in bb1b40a

 rtls_verifier_select(tls_ctx->rtls_handle, evidence->type, 

Same as inclavare-containers/librats#82