[FIX] point_of_sale: correct inheriting from pos_order_line being an issue

Before this commit, when creating a pos_order_line_pro_forma, which inherits from pos_order_line but in a different table, the create confused an overriden field (order_id)
When pos_blackbox was installed, pro forma lines would search for an pos_order instead of a pos_order_proforma upon their creation

This commit allows an inheritant of pos_order_line to use the super.create function

OPW 745685

Closes #18755

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