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go/cros-scanning specifies that saved scanned images will use the
format scan_[local timestamp]_[page number].png. Update scan
service from the old format of scan_[local timestamp]_page_[page
number].png. Also update the unit tests to make sure the file is
being saved correctly.

Bug: b:171512776
Change-Id: I22141319e0d1db79ff9f82da73d671327e015f8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2492926Reviewed-by: Jesse Schettler <jschettler@chromium.org>
Commit-Queue: Paul Moy <pmoy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820294}