Submit whole topic: Only consider open changes

We only want to look at all open changes. This was lost in the
revision of Ib32a4511a0308da32a8c5d1c7b1a6f124a03576e when porting
over to using InternalChangeQuery.

Change-Id: Ib60fff78e5cd7a6256a94c81d98c6d7bb5b19ac6
2 files changed