Disable all preferences (except toggle) when a mode is disabled

Also set some alpha on the circles so that they look more or less disabled as well.

Fixes: 354867828
Test: atest com.android.settings.notification.modes
Flag: android.app.modes_ui
Change-Id: I53ef5e381d37afa20b0532f3c7ddb3f106b2e85e

src/com/android/settings/notification/modes/ZenModePeopleLinkPreferenceController.java

@@ -92,6 +92,7 @@ class ZenModePeopleLinkPreferenceController extends AbstractZenModePreferenceCon
                 ZenSubSettingLauncher.forModeFragment(mContext, ZenModePeopleFragment.class,
                         zenMode.getId(), 0).toIntent());
 
+        preference.setEnabled(zenMode.isEnabled());
         preference.setSummary(mSummaryHelper.getPeopleSummary(zenMode.getPolicy()));
         ((CircularIconsPreference) preference).displayIcons(getPeopleIcons(zenMode.getPolicy()));
     }