Fix expanded fully custom view showing wrong chevron state

Fixes: 206045893
Test: post fully custom notification from Notify2-SC and check expanded chevron
Change-Id: I97db4f9a5cb207d03d1370fa267f630f355c1bf4

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;
         }