fix(n): fixed transfer page bug

PR Summary

Fix Size Assignment in nervos.c The code in line 241 has been corrected to assign the correct length of 65 to resp->signature.size. Previously, this was incorrectly being assigned to resp->signature.bytes.
Update Memory Copy Function in nervos.c For the function memcpy used in line 269, the source parameter has been updated to correctly copy from msg->witness_buffer.bytes instead of msg->witness_buffer. This change ensures that correct data (bytes of msg->witness_buffer) is being copied.