fix(order): tick_size should return arr[0].tick_size, not price_tick

[MukundaKatta]

Fixes #309.

Real bug — copy/paste error in py-hftbacktest/hftbacktest/order.py: the tick_size property was returning self.arr[0].price_tick (integer tick count) instead of self.arr[0].tick_size (float tick size). The underlying dtype in types.py has both fields:

('price_tick', 'i8'),
('tick_size', 'f8'),

So current code returns the wrong value and wrong type (int instead of float64). Trivial 1-character fix.

  @property
  def tick_size(self) -> float64:
      """
      Returns the tick size.
      """
-     return self.arr[0].price_tick
+     return self.arr[0].tick_size

[codacy-production]

Up to standards ✅

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