fix: add UNIT_FIELD_AURAFLAGS to update field name table

UNIT_FIELD_AURAFLAGS was defined in the UF enum and used in Classic and
Turtle JSON files (index 98) but missing from the kUFNames lookup table.
The JSON loader silently skipped it, so Classic/Turtle aura flag data
from UPDATE_OBJECT was never mapped. This could cause aura display
issues on Classic 1.12 and Turtle WoW servers.

src/game/update_field_table.cpp

@@ -34,6 +34,7 @@ static const UFNameEntry kUFNames[] = {
     {"UNIT_FIELD_DISPLAYID", UF::UNIT_FIELD_DISPLAYID},
     {"UNIT_FIELD_MOUNTDISPLAYID", UF::UNIT_FIELD_MOUNTDISPLAYID},
     {"UNIT_FIELD_AURAS", UF::UNIT_FIELD_AURAS},
+    {"UNIT_FIELD_AURAFLAGS", UF::UNIT_FIELD_AURAFLAGS},
     {"UNIT_NPC_FLAGS", UF::UNIT_NPC_FLAGS},
     {"UNIT_DYNAMIC_FLAGS", UF::UNIT_DYNAMIC_FLAGS},
     {"UNIT_FIELD_RESISTANCES", UF::UNIT_FIELD_RESISTANCES},