Fix expanded fully custom view showing wrong chevron state am: 3b3e39f627

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16445238

Change-Id: Idbbbb6a66a2d3a30e73f81c6c48cea072d82b94f

core/java/android/app/Notification.java

@@ -5810,6 +5810,7 @@ public class Notification implements Parcelable
                     p, result);
             buildCustomContentIntoTemplate(mContext, standard, customContent,
                     p, result);
+            makeHeaderExpanded(standard);
             return standard;
         }