message: fuzz: add missing ECCVerifyHandle to base_encode_decode
diff: #include <string>
  #include <vector>
  -FUZZ_TARGET(base_encode_decode)
  +void initialize_base_encode_decode()
  +{
  + static const ECCVerifyHandle verify_handle;
  +}
  +
  +FUZZ_TARGET_INIT(base_encode_decode, initialize_base_encode_decode)
  {
  const std::string random_encoded_string(buffer.begin(), buffer.end());
  