[C++] Use correct boost error code in Directory.h
[C++] Use correct boost error code in Directory.h

Change-Id: I142d0ffc80bdadb005ac4f9b507c46fb1af7414d

bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,clive-jevons/joynr,clive-jevons/joynr,clive-jevons/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr