Fixed a bug where the top child notification wasn't expandable

Because we also applied the hack to the expand helper to dismiss
the whole group instead of the child.

Bug: 27420342
Change-Id: I6179d3b99150c8005d0c45b6efdabb2de4dbe941
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java b/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
index 12a83fd..27b94d1 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/ExpandableNotificationRow.java
@@ -411,8 +411,7 @@
     }
 
     public ExpandableNotificationRow getViewAtPosition(float y) {
-        if (!mIsSummaryWithChildren || !mChildrenExpanded
-                || (getNotificationChildren().size() == 1 && isClearable())) {
+        if (!mIsSummaryWithChildren || !mChildrenExpanded) {
             return this;
         } else {
             ExpandableNotificationRow view = mChildrenContainer.getViewAtPosition(y);