example: use layout_sidebar() not page_sidebar()

Author: cpsievert

examples/brand/app.py

@@ -16,7 +16,7 @@
 app_ui = ui.page_navbar(
     ui.nav_panel(
         "Input Output Demo",
-        ui.page_sidebar(
+        ui.layout_sidebar(
             ui.sidebar(
                 ui.input_slider("slider1", "Numeric Slider Input", 0, 11, 11),
                 ui.input_numeric("numeric1", "Numeric Input Widget", 30),