Files app: Fix path handling for files in the trash bin

Ensure that the original path is correctly escaped when written into the
`.trashinfo` file.

BUG=b:331694447, b:331710264, b:331711206
TEST=chromeos_unittests --gtest_filter=TrashServiceTest*
TEST=unit_tests --gtest_filter=*TrashIOTaskTest*

Change-Id: I9081cd10e05c846941a5e43c5e165eccf74b8a1d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5411072


Commit-Queue: François Degros <fdegros@chromium.org>
Reviewed-by: Ben Reich <benreich@chromium.org>
Auto-Submit: François Degros <fdegros@chromium.org>
Commit-Queue: Ben Reich <benreich@chromium.org>
Reviewed-by: Wenbo Jie <wenbojie@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1281669}