Fix back button state issue

Back button / down chevron button (eg when you have an IME visible)
was not getting synced on rotation changes

Bug: 6133831
Change-Id: Iefaf3babf92898fcc87a0b14c10b037de04d84e2

packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java

@@ -304,6 +304,8 @@ public class NavigationBarView extends LinearLayout {
         if (DEBUG) {
             Slog.d(TAG, "reorient(): rot=" + mDisplay.getRotation());
         }
+
+        setNavigationIconHints(mNavigationIconHints, true);
     }
 
     @Override