Fix maximum time to lock

Changes
* Restore previous timeout behaviour. This
  behaviour was modified in Android S and
  was previously working on Android R.
* If the selected timeout is less than
  the max timeout set by the admin, select
  the largest possible timeout.
* If there are no possible timeouts for the
  user, disable the preference.

Manual testing steps
* Download CtsVerifier and CtsEmptyDeviceOwner apks
* Set device owner
* Run Policy transparency test > set max time to lock
* Set max time to lock and verify correct value is
  shown in Settings. Compare behaviour with Android R.

Bug: 184104507
Test: manual testing
      atest com.android.settings.display.ScreenTimeoutSettingsTest
Change-Id: I8d0e66ccce14cca244bcd380fd225a31df0b8999

src/com/android/settings/display/ScreenTimeoutSettings.java

@@ -145,6 +145,16 @@ public class ScreenTimeoutSettings extends RadioButtonPickerFragment implements
             screen.addPreference(pref);
         }
 
+        final long selectedTimeout = Long.parseLong(defaultKey);
+        final long maxTimeout = getMaxScreenTimeout(getContext());
+        if (!candidateList.isEmpty() && (selectedTimeout > maxTimeout)) {
+            // The selected time out value is longer than the max timeout allowed by the admin.
+            // Select the largest value from the list by default.
+            final RadioButtonPreference preferenceWithLargestTimeout =
+                    (RadioButtonPreference) screen.getPreference(candidateList.size() - 1);
+            preferenceWithLargestTimeout.setChecked(true);
+        }
+
         if (isScreenAttentionAvailable(getContext())) {
             mAdaptiveSleepPermissionController.addToScreen(screen);
             mAdaptiveSleepController.addToScreen(screen);