Add settings button to the toolbar

The button is shown when there is an ongoing recording. It updates the details visibility

Flag: com.android.systemui.new_screen_record_toolbar
Fixes: 442541204
Test: manual on foldable: check that the button only appears during the recording and that it controls details visibility
Change-Id: I5effd19a71176883ea6dfbc14d47a0fc40d3a46e