fix: Avoid update_order twice on Kanban load (#19011)

* fix: Avoid `update_order` twice on kanban load

- The older logic called `kanban.update()` on a refresh (not on load) and returned from `render()`
- Due to a recent PR, it calls `kanban.update()` AND builds a new board on load, which invokes `update_order` twice consecutively and causes a timestamp error to be thrown

* chore: Remove redundant condition

Co-authored-by: Ritwik Puri <ritwikpuri5678@gmail.com>

frappe/public/js/frappe/views/kanban/kanban_view.js

@@ -175,9 +175,7 @@ frappe.views.KanbanView = class KanbanView extends frappe.views.ListView {
 				cur_list: this,
 				user_settings: this.view_user_settings,
 			});
-		}
-
-		if (this.kanban && board_name === this.kanban.board_name) {
+		} else if (board_name === this.kanban.board_name) {
 			this.kanban.update(this.data);
 		}
 	}