Fix $returningId() to correctly set selected fields

The local variable `returning` computes the selected fields in
$returningId() but throws this away. Change to correctly
store config in the insert query builder.

Fixed #2971

drizzle-orm/src/mysql-core/query-builders/insert.ts

@@ -16,8 +16,8 @@ import type { Placeholder, Query, SQLWrapper } from '~/sql/sql.ts';
 import { Param, SQL, sql } from '~/sql/sql.ts';
 import type { InferModelFromColumns } from '~/table.ts';
 import { Table } from '~/table.ts';
-import { mapUpdateSet, orderSelectedFields } from '~/utils.ts';
-import type { AnyMySqlColumn, MySqlColumn } from '../columns/common.ts';
+import { mapUpdateSet } from '~/utils.ts';
+import type { AnyMySqlColumn } from '../columns/common.ts';
 import type { SelectedFieldsOrdered } from './select.types.ts';
 import type { MySqlUpdateSetSource } from './update.ts';
 
@@ -252,7 +252,7 @@ export class MySqlInsertBase<
 				returning.push({ field: value, path: [key] });
 			}
 		}
-		this.config.returning = orderSelectedFields<MySqlColumn>(this.config.table[Table.Symbol.Columns]);
+		this.config.returning = returning;
 		return this as any;
 	}