[C++] Added missing member to initialization list of constructor of SubscriptionManager
[C++] Added missing member to initialization list of constructor of SubscriptionManager

Change-Id: I14954e2a4ed0fe0e704a9844a641d86f73ef9a7d

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr