We don't actually know. Moffat hasn't given us a list of which stories were erased by the cracks; all he's told us is:
- It included "The Stolen Earth" and "The Next Doctor".
- It didn't include everything in series 1-4.
- The net effect is that most of humanity generally doesn't know about any alien invasions.
So, the question is, is it possible that the Battle of Canary Wharf was effectively covered up? It doesn't seem likely, but it's not completely impossible.
It's also possible that the event was neither erased nor covered up, but very few people saw the Daleks (who were in the Torchwood Tower), just the Cybermen (who might have been explained away somehow).