[0465] Fixed drop chance of items 18969 and 18972
* Correcting drops of Pristine Yeti Hide (Alliance) and Perfect Yeti Hide (Horde)
Corrected drop rate to 2.5%
Removing from Lurking Feral Scar ID:7848
Listed as dropping at very low rates on some sites, most likely due to bug where loot
is counted to new targeted mob if you switch targets before loot window appears.
Added in PreReq quests.
The Mark of Quality ID:7733  ALLIANCE
The Mark of Quality ID:7734  HORDE

Signed-off-by: Cala Haryon <calaftp@free.fr>