[C++] use “=default” for empty SteadyTimer destructor
[C++] use “=default” for empty SteadyTimer destructor

Change-Id: I1b8ecfb095d43cef928b2e3eeb0090723d3669ff

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