Fix “Learn more” link not working on Magnification shortcut page from Vision Settings

Root cause: It does not allow to start another activity before SuW
Completed. We should not show link for users.
Solution: Remove the link

Bug: 188034493
Test: Manual testing
Change-Id: I25d3eb3d02a2b992411ea7b73308f3e3503cd70a

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

@@ -44,6 +44,12 @@ public class ToggleScreenMagnificationPreferenceFragmentForSetupWizard
         super.onStop();
     }
 
+    @Override
+    public int getHelpResource() {
+        // Hides help center in action bar and footer bar in SuW
+        return 0;
+    }
+
     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);