Rename flight speed related auras

[sogladev]

Changes Proposed:

Rename flight speed related auras from azerothcore/azerothcore-wotlk#20079

206 SPELL_AURA_MOD_INCREASE_VEHICLE_FLIGHT_SPEED -> SPELL_AURA_MOD_INCREASE_FLIGHT_SPEED
208 SPELL_AURA_MOD_INCREASE_FLIGHT_SPEED -> SPELL_AURA_MOD_FLIGHT_SPEED_ALWAYS
210 SPELL_AURA_MOD_VEHICLE_SPEED_ALWAYS -> SPELL_AURA_MOD_FLIGHT_SPEED_NOT_STACKING

Issues Addressed:

• Closes

SOURCE:

Tests Performed:

How to Test the Changes:

Known Issues and TODO List:

• [ ]
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