Stop showing disclosure UI when isDisclosureEnabled is false.

Bug: 137395050
Change-Id: Ic7768f7d3306f5d9d5c5c988afda4e8710c4ccd0
Test: Manual tests

core/java/com/android/internal/app/AssistUtils.java

@@ -195,7 +195,7 @@ public class AssistUtils {
         return applicationInfo.isSystemApp() || applicationInfo.isUpdatedSystemApp();
     }
 
-    private static boolean isDisclosureEnabled(Context context) {
+    public static boolean isDisclosureEnabled(Context context) {
         return Settings.Secure.getInt(context.getContentResolver(),
                 Settings.Secure.ASSIST_DISCLOSURE_ENABLED, 0) != 0;
     }

packages/SystemUI/src/com/android/systemui/assist/AssistManager.java

@@ -219,7 +219,7 @@ public class AssistManager implements ConfigurationChangedReceiver {
         intent.setComponent(assistComponent);
         intent.putExtras(args);
 
-        if (structureEnabled) {
+        if (structureEnabled && AssistUtils.isDisclosureEnabled(mContext)) {
             showDisclosure();
         }