Move PreferenceControllers to member variables to prevent memory leak

- Move PreferenceControllers to xml
- Clean up the PreferenceController so that it's less tied to a fragment
- Update and clean up the related robolectric test, so there are less
  mocks needed

Bug: 352606511
Test: manually check the Color Correction screen is shown correctly, and
choosing color correction options are reflected correctly
Test: atest DaltonizerRadioButtonPreferenceControllerTest
Test: atest ToggleDaltonizerPreferenceFragmentTest
Flag: EXEMPT (moving controller to xml can't be flagged)

Change-Id: I89b9366cfd7a398bb0572d34226d31d49373fd94