Enables keyboard option by default.

This just enables the setting for this feature. The default
value of the setting itself is still false.

Bug: 231433168
Test: Manually verified the option worked as expected, including
showing the user education when typing directly in All Apps
without tapping the QSB. Also verified previous features like
the snackbar to enable keyboard by default worked as before.

Change-Id: If423ae49436d1bf71579d52a99aea5ca3f2407dc