fix: Fixes double calls with Target cancel and spell sequences (#1840)

### Summary
- Cleans up target cancellation being called incorrectly.
- An invalid target type (which should never happen), now calls `OnTargetUntargetable` instead of `OnTargetCanceled`
- Removes double calls to `FinishSequence` in Spells.

Projects/UOContent/Spells/Chivalry/CloseWounds.cs

@@ -78,8 +78,6 @@ namespace Server.Spells.Chivalry
                 m.FixedParticles(0x376A, 1, 62, 9923, 3, 3, EffectLayer.Waist);
                 m.FixedParticles(0x3779, 1, 46, 9502, 5, 3, EffectLayer.Waist);
             }
-
-            FinishSequence();
         }
 
         public override bool CheckCast()