JS: Fix missing boundary bytes in PathSet serialization.
JS: Fix missing boundary bytes in PathSet serialization.

wilsonianb/ripple-lib,ripple/ripple-lib,wilsonianb/ripple-lib,ripple/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib,wilsonianb/ripple-lib,darkdarkdragon/ripple-lib,ripple/ripple-lib,darkdarkdragon/ripple-lib