Fix expanded fully custom view showing wrong chevron state am: 3b3e39f627 am: 4ec4414a08

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

Change-Id: I82c728f54ef12e35bfe00b90877007688851961c

core/java/android/app/Notification.java

@@ -5808,6 +5808,7 @@ public class Notification implements Parcelable
                     p, result);
             buildCustomContentIntoTemplate(mContext, standard, customContent,
                     p, result);
+            makeHeaderExpanded(standard);
             return standard;
         }