[Files app] Add context menu test for Zip root

Change archive.zip test file to contain a folder and update tests
accordingly.

Add a new function getUnzippedFileListRowEntriesEncrypted, because
archive.zip and encrypted.zip content differ.

Change-Id: I7ff9d2020efe692f7e6ca8302fbad8f3851716f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1514291
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Stuart Langley <slangley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641502}
5 files changed