[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
[z2479] Added exception to allow/restrict use of specific mounts

Changed SpellCastResult Spell::CheckCast(bool strict) by adding specific
case for AQ40 mounts making them unusable outside the instance and
defining them as the only mounts usable inside.