Fix overlapped Voice Access labeled item in shortcut component.

The label of shortcut preference and checkbook are overlapped, but only
the checkbox can be triggered.

Action: set parent layout to be non-selectable.

Bug: 149627994
Test: Manual test
Change-Id: Ic0b58159111c27ef94b10c6935178c3b80995d11

src/com/android/settings/accessibility/ShortcutPreference.java

@@ -165,6 +165,9 @@ public class ShortcutPreference extends Preference {
         setWidgetLayoutResource(R.layout.preference_widget_settings);
         setIconSpaceReserved(false);
         mAutoEnabledSettings = true;
+
+        // Disable whole component to let each child component can be addressed.
+        setSelectable(false);
     }
 
     private void callOnSettingsClicked() {