Snap: Fix Undo button behaviour

The undo behaviour depends on if the camera present secure settings
or not. If secure, it should have 1 placeholder. 0 in other cases.

Repro (for non secure cameras):
1. Leave only 3 pictures on the album.
2. Delete one picture, it will work fine.
3. Leave only 2 pictures on the album.
4. Try to delete, and you will go straight to the camera,
without the undo pannel showing up.

Change-Id: I360076381867a74628ffa492065ccf2ca53c72d6
1 file changed