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/CleanseByFire.cs

@@ -98,8 +98,6 @@ namespace Server.Spells.Chivalry
 
                 AOS.Damage(Caster, Caster, damage, 0, 100, 0, 0, 0, true);
             }
-
-            FinishSequence();
         }
 
         public override bool CheckCast()

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()

Projects/UOContent/Spells/Chivalry/RemoveCurse.cs

@@ -124,8 +124,6 @@ namespace Server.Spells.Chivalry
                     m.PlaySound(0x1DF);
                 }
             }
-
-            FinishSequence();
         }
 
         public override bool CheckCast()

Projects/UOContent/Spells/Chivalry/SacredJourney.cs

@@ -109,8 +109,6 @@ namespace Server.Spells.Chivalry
                 Caster.MoveToWorld(loc, map);
                 Caster.PlaySound(0x1FC);
             }
-
-            FinishSequence();
         }
 
         public override void OnCast()
@@ -122,6 +120,7 @@ namespace Server.Spells.Chivalry
             else
             {
                 Effect(m_Entry.Location, m_Entry.Map, true);
+                FinishSequence();
             }
         }