Core/Movement: ported some undermap fixups from a TC pull request

src/server/game/Spells/Spell.cpp

@@ -1379,9 +1379,8 @@ void Spell::SelectImplicitCasterDestTargets(SpellEffIndex effIndex, SpellImplici
                 pos.m_positionX = m_preGeneratedPath->GetActualEndPosition().x;
                 pos.m_positionY = m_preGeneratedPath->GetActualEndPosition().y;
                 pos.m_positionZ = m_preGeneratedPath->GetActualEndPosition().z;
+                dest.Relocate(pos);
             }
-
-            dest.Relocate(pos);
             break;
         }
         default: