[Fix] Not able to export the Supplier-Wise Sales Analytics report (#15271)

diff --git a/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py b/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
index 78d1c44..1d69429 100644
--- a/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
+++ b/erpnext/stock/report/supplier_wise_sales_analytics/supplier_wise_sales_analytics.py
@@ -33,7 +33,7 @@
 
 				row = [cd.item_code, cd.item_name, cd.description, cd.stock_uom, \
 					consumed_qty, consumed_amount, delivered_qty, delivered_amount, \
-					total_qty, total_amount, list(set(suppliers))]
+					total_qty, total_amount, ','.join(list(set(suppliers)))]
 				data.append(row)
 
 	return columns, data