Core/Objects: replaced another IsFlying check with CanFly to make sure that hovering creatures will get their ground height returned properly

*also fixed a small typo in path generator

src/server/game/Entities/Object/Object.cpp

@@ -2620,7 +2620,7 @@ void WorldObject::MovePositionToFirstCollision(Position &pos, float dist, float
         if (Unit const* unit = ToUnit())
         {
             // flying, ignore.
-            if (unit->IsFlying())
+            if (unit->CanFly())
                 return;
 
             // fall back to gridHeight if any