Set face unlock toggle to unchecked when disabled by admin

Bug: 135747161
Test: make RunSettingsRoboTests
    ROBOTEST_FILTER=FaceSettingsLockscreenBypassPreferenceControllerTest
Change-Id: I1e3d105184a14bfece972abb096eac44bd186273

src/com/android/settings/biometrics/face/FaceSettingsLockscreenBypassPreferenceController.java

@@ -47,6 +47,11 @@ public class FaceSettingsLockscreenBypassPreferenceController
 
     @Override
     public boolean isChecked() {
+        if (!FaceSettings.isAvailable(mContext)) {
+            return false;
+        } else if (getRestrictingAdmin() != null) {
+            return false;
+        }
         int defaultValue = mContext.getResources().getBoolean(
                 com.android.internal.R.bool.config_faceAuthDismissesKeyguard) ? 1 : 0;
         return Settings.Secure.getIntForUser(mContext.getContentResolver(),