Fix the free max riding bug and take it away from those who didn't buy it

[Kaivax]

Riding Skill Bug

Earlier this week, we identified a bug in the Burning Crusade Classic Anniversary pre-patch which incorrectly granted the 150 Epic riding skill to some player-characters. Purchasing Journeyman Riding is an important milestone in each character’s journey, and this milestone deserves to be preserved. To address this, we will remove the incorrectly-granted riding skill from player-characters who were identified as affected by this bug, and we’ll revert their riding skill to 75. The fix-up will oc…