message: fix lua syntax
diff: //_inlet_simple_types_fields_input_start
  a_simple_bool = true
  -a_simple_int = 5,
  -a_simple_double = 7.5,
  -a_simple_string = 'such simplicity',
  +a_simple_int = 5
  +a_simple_double = 7.5
  +a_simple_string = 'such simplicity'
  //_inlet_simple_types_fields_input_end
  */
  @@ -30,9 +30,9 @@ int main()
  std::string input = R""""(
  a_simple_bool = true
  - a_simple_int = 5,
  - a_simple_double = 7.5,
  - a_simple_string = 'such simplicity',
  + a_simple_int = 5
  + a_simple_double = 7.5
  + a_simple_string = 'such simplicity'
  )"""";
  // Create Inlet Reader that supports Lua input files
  