Fix spurious PV warning in JetTagDQA

Thomas Streblerrequested to merge
tstreble-24.0-patch-06ae into 24.0

The JetTagDQA was reporting spurious warning due to

if (m_PV_x != -999.) ATH_MSG_WARNING( ".... second PV in the events ...!!!!!!");

because m_PV_x was keeping the value from the previous event.

Fixed by making the PV variable local to the execute function rather than class members.

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