Issue with summary tax

Test case in GardenWorld:

• Create an order with one line for $100 using GST/PST tax

Two different behaviors here:

• Complete the order directly

• The order is wrongly totalized as $129 (must be $114.50)

• The order has three taxes - the summary and the two children (must be just the children - check the invoice created and the invoice just have the children correctly)

A different behavior happens if the invoice is prepared first:

• Prepare the order

• Complete the order

• The order is totalized correctly as $114.50

• The order has wrongly three taxes