ActorActiveSpells:add shows enemy health bar when adding healing effect on self

Healthbar should only be shown when casting healing or damage effects on targets that are not self. Currently it is shown in both cases anyway.

Steps to reproduce:

1. Open console
2. luap
3. types.Actor.activeSpells(self):add{caster = self.object, id = "hearth heal", effects = {0}}

Shows enemy healthbar despite target being self.