chore(magnification suw): Hide feedback preference in setup wizard

Bug: 380346799
Flag: com.android.server.accessibility.enable_low_vision_hats
Test: atest MagnificationFeedbackPreferenceControllerTest
            MagnificationFollowTypingPreferenceControllerTest
            MagnificationJoystickPreferenceControllerTest
            MagnificationOneFingerPanningPreferenceControllerTest
            ToggleScreenMagnificationPreferenceFragmentTest
Change-Id: I84f673235a8a4d97667edaabf72d46b985f33351