JetMomentTools: Fix uninitialized handle.
JetBalancePFlowJvtTool was not initializing m_eventInfoKey from the base class. Fix by having it call initialize() from the base class rather than duplicating the code in the derived class.
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JetBalancePFlowJvtTool was not initializing m_eventInfoKey from the base class. Fix by having it call initialize() from the base class rather than duplicating the code in the derived class.