Do not show immersive mode help in touch exploration mode.

Bug: 11277364
Change-Id: Ifafcbff38e34c0ef08d9a466d93ce591369183a3
diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
index 816672f..dcaf3d6 100644
--- a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -5186,7 +5186,8 @@
         final int flags = View.SYSTEM_UI_FLAG_IMMERSIVE | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
         return mNavigationBar != null
                 && (vis & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) != 0
-                && (vis & flags) != 0;
+                && (vis & flags) != 0
+                && canHideNavigationBar();
     }
 
     /**