Click a parent folder should open that folder.

Change-Id: I28b40d16fa0e639a124b7372bdc9a35dc8a754a4
diff --git a/src/com/android/mail/ui/AbstractActivityController.java b/src/com/android/mail/ui/AbstractActivityController.java
index cd91ad2..66450da 100644
--- a/src/com/android/mail/ui/AbstractActivityController.java
+++ b/src/com/android/mail/ui/AbstractActivityController.java
@@ -456,7 +456,8 @@
 
     @Override
     public void onFolderChanged(Folder folder) {
-        if (folder != null && !folder.equals(mFolder)) {
+        if (folder != null && !folder.equals(mFolder)
+                || (mViewMode.getMode() != ViewMode.CONVERSATION_LIST)) {
             updateFolder(folder);
             mConvListContext = ConversationListContext.forFolder(mContext, mAccount, mFolder);
             showConversationList(mConvListContext);