fix: exclude transferred_qty from work order item to pick list item mapping

get_mapped_doc copies same-named fields by default. work order item's
transferred_qty (cumulative across the whole work order) was leaking into
the new pick list item's transferred_qty (meant to track how much of
that pick list row has been converted into a stock entry, starting at 0).

the leaked value then got subtracted again in
get_pending_transfer_stock_qty(), so every pick list after the first
under-transferred raw materials by whatever was already recorded on the
work order, driving material_transferred_for_manufacturing towards zero
across repeated partial pick-list/finish cycles.

fixes #57236, related to #56596

erpnext/manufacturing/doctype/work_order/mapper.py

@@ -488,6 +488,7 @@ def _pick_list_mapping(postprocess):
 		"Work Order": {"doctype": "Pick List", "validation": {"docstatus": ["=", 1]}},
 		"Work Order Item": {
 			"doctype": "Pick List Item",
+			"field_no_map": ["transferred_qty"],
 			"postprocess": postprocess,
 			"condition": lambda doc: abs(doc.transferred_qty) < abs(doc.required_qty),
 		},