[z2478] Makes Paladin's talent Benediction reduces mana cost of Seal of Crusader and Seal of Command. Thx Neotmiren

Author: Neotmiren. Issue pointed out in Classic DB
https://github.com/classicdb/database/issues/157
Fixed by @Neotmiren
adapt z2478_xxxxx_01_mangos_spell_affect
Merge pull request #72 from wowpsp/master

Fixed missing SQL revision number in z2478.
Merge git://github.com/cmangos/mangos-classic