Scripts/Krikthir the Gatewatcher: Fix EVENT_ANUBAR_CHARGE event not being triggered

Fix EVENT_ANUBAR_CHARGE not being triggered due to value 0 being set to the EVENT_ANUBAR_CHARGE enum, even if 0 is a special value for EventMap to specify no event was triggered.
Issue added in a127c0e1a7612094c2bf8b2f5092f55aa96f0556