Add Preference file created in WebView Captured Sites test to allowlist.

In captured sites test tool, visited urls (via embedded server) are logged in AwOriginVisitLoggerPrefs, but webview tests are unable to hook in to InMemorySharedPreferences so file remains after test finish

This CL adds AwOriginVisitLoggerPrefs.xml to existing allowlist

See go/autofill-webview-automation-design for more details.

Bug: 1470390

Change-Id: I8c0ed5807f4c83ab718c17f31bc8b4dabeba9862
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4781367


Reviewed-by: Ian Struiksma <ianstruiksma@google.com>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Neil Estrada <neilestrada@google.com>
Cr-Commit-Position: refs/heads/main@{#1184842}