mandoline filesystem: add apptests to runner data file.
mandoline filesystem: add apptests to runner data file.

This makes us run the filesystem_apptests. This should have been added a
while back.

BUG=490237

Review URL: https://codereview.chromium.org/1173113003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#333832}

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