Properly handle old style (<= 1.6) account shortcuts.

A desktop shortcut to an account created on donut or before points at
com.android.email/.activity.FolderMessageList, which we've already removed.

- Added a dummy FolderMessageList to receive it and redirect to MessageList.
- Removed FolderMessageListUnitTests, which was left unremoved.

Bug 2535335

Change-Id: Ie5ffa158882633a4929c4c47a3d9625fd1626863
1 file changed