Fix crosdl wrapper to correctly find recovery image file.

A gsutil change has broken the part of this wrapper which calls gsutil and
downloads an image file.

BUG=None
TEST=Ran it

Change-Id: I5870a544189598867cf2eb6b53341c8677d3d6a0
Reviewed-on: https://chromium-review.googlesource.com/245080
Tested-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Reviewed-by: Mussa Kiroga <mussa@chromium.org>
Commit-Queue: Katherine Threlkeld <kathrelkeld@chromium.org>
1 file changed