NEXUS-5472: Fixing the build.

Forgot the update UT wrt core changes.
NEXUS-5472: Fixing UT

EventDispatcher was inactive, was receiving events but not doing
what it had to do since the AppStatusSource used in UTs
(BuildApplicationStatusSource) is not handled and all, and
was not marking Nexus state as "started". Hence, propagation
and "live" maintenance of hosted repo WL did not happen at all