message: Update allowed_args.cpp
  Use define, rather than hard-coded string
diff: @@ -605,7 +605,8 @@ static void addNodeRelayOptions(AllowedArgs &allowedArgs)
  .addArg("use-bloom-filter-targeting", optionalBool,
  _("Enable thin block bloom filter targeting which helps to keep the size of bloom filters to a minumum "
  "although it can impact performance. (default: 0)"))
  - .addArg("use-grapheneblocks", optionalBool, _("Enable graphene to speed up the relay of blocks (default: 1)"));
  + .addArg("use-grapheneblocks", optionalBool,
  + strprintf(_("Enable graphene to speed up the relay of blocks (default: %d)"), DEFAULT_USE_GRAPHENE_BLOCKS));
  }
  static void addBlockCreationOptions(AllowedArgs &allowedArgs)
  