COMMITTED: SE_ImprovedSpellEffect

[Caryatis]

this was flawed as it would trigger if you cured the debuff... however I moved the code out to the dobufftic function.

spell effects.cpp - line 3297 - add this

		case SE_ImprovedSpellEffect:
		case SE_BossSpellTrigger:
		case SE_CastOnWearoff:
		{
			if (ticsremaining == 1) 
			{
				SpellOnTarget(spells[spell_id].base[i], this);
			}
			break;
		}

Seems to work as intended now.