Fix "Play media to" popup close issue when screen rotate

- Avoid calling getListPreference() in onDialogClose() everytime.
  Due to exception in onDialogClose(). Move preference declaration into if condition.
- Add test case for crash case.

Bug: 119744621
Test: make -j50 RunSettingsRoboTests ROBOTEST_FILTER=UpdatableListPreferenceDialogFragmentTest
Change-Id: Ia20b8289a5863136ea74e02e32b537f6967474e8