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Issue #3568323: Fix OrderFixedAmountOff create() to use parent::create()
The create() method used new static() directly, bypassing the parent
chain (OrderPromotionOfferBase and PromotionOfferBase). This left
$this->splitter, $this->rounder uninitialized and skipped
setConfiguration(), causing a fatal error when applying fixed amount
order promotions.
Use the same parent::create() pattern that OrderItemFixedAmountOff already follows in this module.
Closes #3568323