Update KeyboardLayoutPickerControllerTest

The logic is changed, so we need to update the test. (https://screenshot.googleplex.com/AnrJgmGfK2fPxmQ.png)

Bug: 270109384
Test: atest KeyboardLayoutPickerControllerTest
[1/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#isAlwaysAvailable: PASSED (5.876s)
[2/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#test_createPreferenceHierarchy_shouldAddTwoPreference: PASSED (192ms)
[3/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#testOnDeviceRemove_getSameDevice_shouldFinish: PASSED (5.797s)
[4/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#testLifecycle_onStart_shouldRegisterInputManager: PASSED (1.495s)
[5/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#test_createPreferenceHierarchy_shouldAddOnePreference: PASSED (75ms)
[6/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#testOnDeviceRemove_getDifferentDevice_shouldNotFinish: PASSED (366ms)
[7/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#testLifecycle_onStop_shouldCancelRegisterInputManager: PASSED (65ms)
[8/8] com.android.settings.inputmethod.KeyboardLayoutPickerControllerTest#testLifecycle_onStart_NoInputDevice_shouldReturn: PASSED (309ms)

Change-Id: I018873cba9e73c6d684d828858cc1b08d3f2f7f9