message: refactor: Fix clang compile failure
  script/standard.cpp:278:22: error: default initialization of an object of const type 'const (anonymous namespace)::CScriptVisitor' without a user-provided default constructor
  const CScriptVisitor g_script_visitor;
  ^
  {}
  1 error generated.
diff: @@ -290,14 +290,11 @@ public:
  return CScript() << CScript::EncodeOP_N(id.version) << std::vector<unsigned char>(id.program, id.program + id.length);
  }
  };
  -
  -const CScriptVisitor g_script_visitor;
  -
  } // namespace
  CScript GetScriptForDestination(const CTxDestination& dest)
  {
  - return boost::apply_visitor(::g_script_visitor, dest);
  + return boost::apply_visitor(CScriptVisitor{}, dest);
  }
  CScript GetScriptForRawPubKey(const CPubKey& pubKey)
  