Deprecated function in theme_boost_o365teams columns2 layout

[weilai-irl]

When showing pages using columns2 layout in theme_boost_o365teams, if debugging is turned on, the page would should warning messages like this:

user_preference_allow_ajax_update() is deprecated. Please use the "core_user/repository" module instead.
line 41 of /lib/ajax/ajaxlib.php: call to debugging()
line 27 of /theme/boost_o365teams/layout/columns2.php: call to user_preference_allow_ajax_update()
line 1474 of /lib/outputrenderers.php: call to include()
line 1399 of /lib/outputrenderers.php: call to core_renderer->render_page_layout()
line 72 of /admin/themeselector.php: call to core_renderer->header()

This applies to Moodle 4.3/4.4/4.5.

The cause is the layout uses a deprecated function.