This commit corrects the following bug:
* Create a note N in an empty deck D of type basic (reverse), with
only some back, no front. Only card 2 will be generated.
* Edit the note, add a front. Card 1 will be generated.
* In the main window, try to learn deck D. In anki, currently, you'll
see Card 2 first. According to the manual (and to my common sens),
it should be Card 1 first.
This commit correct this bug, and ensure that new cards are seen
according to their order, and not to their creation date.
8e0077335a