Update Items.php

Fixes the problem where 'Supplier ID' is not saved during csv import.

application/controllers/Items.php

@@ -886,7 +886,7 @@ public function import_csv_file()
 						'hsn_code' => $row['HSN'],
 						'pic_filename' => $row['Image']);
 
-					if(!empty($row['supplier_id']))
+					if(!empty($row['Supplier ID']))
 					{
 						$item_data['supplier_id'] = $this->Supplier->exists($row['Supplier ID']) ? $row['Supplier ID'] : NULL;
 					}