Always keep local drafts

Encrypted messages are not added to the remote folder

app/src/main/java/eu/faircode/email/Core.java

@@ -1883,6 +1883,7 @@ class Core {
                 }
             } else {
                 // Delete not synchronized messages without uid
+                if (!EntityFolder.DRAFTS.equals(folder.type))
                     db.message().deleteOrphans(folder.id);
             }