Update Wormblight / Take 2: WO Fix

It was pointed out that Writhing One relies on the 'worm' attribute for healing from wormblight pools created by the WtW pet's Infestation. The previous fix negated that. We amend the damage type to check for the 'worm' attribute again and make the 'worm' attribute a passive part of Infestation rather than part of the sustain. This prevents damage/death from wormblight if the sustain is deactivated. We also add a reaction check when deciding healing to prevent Writhing Ones and Reavers from healing from their foe's wormblight.