replace '<string>' source name with '[string]'

src/logic/scripting/lua/libs/libjson.cpp

@@ -11,7 +11,7 @@ static int l_json_stringify(lua::State* L) {
 
 static int l_json_parse(lua::State* L) {
     auto string = lua::require_string(L, 1);
-    auto element = json::parse("<string>", string);
+    auto element = json::parse("[string]", string);
     return lua::pushvalue(L, element);
 }