[V8] Pressing minus button increases POS order sequence

[JGarcia-Panach]

I have tested in several instances of runbot.

• If the shopping cart is empty and you press minus button,
  
• Number of POS order sequence increases (each time you press)
  
• Also, if you have selected some products and you press minus button, POS asks you about destroying current order.
  If you confirm, it also increases POS order sequence.

Thanks!

[pedrobaeza]

This is the standard behaviour, because you're removing the current POS order. As POS requires to have always on load order, it creates a new one each time.