Core/Misc: Apply fatigue when flying too

Fix #22856

src/server/game/Entities/Player/Player.cpp

@@ -25447,9 +25447,6 @@ void Player::SetOriginalGroup(Group* group, int8 subgroup)
 
 void Player::ProcessTerrainStatusUpdate(ZLiquidStatus status, Optional<LiquidData> const& liquidData)
 {
-    if (IsFlying())
-        return;
-
     // process liquid auras using generic unit code
     Unit::ProcessTerrainStatusUpdate(status, liquidData);