Update tenzin-kibana-dashboard.json
Update tenzin-kibana-dashboard.json

Removed severity charts from ctia_event and ctia_judgement dashboards.
threatgrid/ctia,threatgrid/ctia,polygloton/ctia,quoll/ctia,threatgrid/ctia,polygloton/ctia,saintx/ctia,threatgrid/ctia,yogsototh/ctia,quoll/ctia,yogsototh/ctia,polygloton/ctia,quoll/ctia,yogsototh/ctia,saintx/ctia,saintx/ctia