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.

Author: MarcoFalke

src/script/standard.cpp

@@ -274,14 +274,11 @@ class CScriptVisitor : public boost::static_visitor<CScript>
         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)