Use the screen context when adding preferences.

When the context from the controller itself is used, it is
not the correct context and causes the created preferences to
be styled incorrectly. By using the screen's context directly,
we can ensure that the preferences inherit the correct style.

Change-Id: I02503e5f4fab8f8110e5d29bd3a479f0ce1d6aca
Fixes: 35891968
Test: Robotest