Email: Fix FC when adding attachment twice

FC occurs when user added attachment and try to add a new
one. Root cause is that attachment preview image will be
saved when go to DocumentsUI at the second time. The image
data is large, hence it causes TransactionLargeException.
So don't save the preview image since it's unnecessary.

CRs-Fixed: 2236176

Change-Id: I05220dafa69760dde9f00daace0897ce07cce668
Issue: FP2P-518
(cherry picked from commit 455b45b5cd61613a81e7703bab639367247f377d)
diff --git a/src/com/android/mail/ui/AttachmentTile.java b/src/com/android/mail/ui/AttachmentTile.java
index da1a4b9..36deea9 100644
--- a/src/com/android/mail/ui/AttachmentTile.java
+++ b/src/com/android/mail/ui/AttachmentTile.java
@@ -253,7 +253,6 @@
         @Override
         public void writeToParcel(Parcel dest, int flags) {
             dest.writeString(attachmentIdentifier);
-            dest.writeParcelable(preview, 0);
         }
 
         public static final Parcelable.Creator<AttachmentPreview> CREATOR
@@ -271,7 +270,6 @@
 
         private AttachmentPreview(Parcel in) {
             attachmentIdentifier = in.readString();
-            preview = in.readParcelable(null);
         }
 
         public AttachmentPreview(Attachment attachment, Bitmap preview) {