2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/52851Withdrawn due to the existence of the main result in Phys.Rev. D69 (2004) 105010, hep-th/0312266 (based on earlier results in JHEP 0304 (2003) 039, hep-th/0212008).This note has been withdrawn by the authorHigh Energy Physics - Theorytext