Revert "android: disable one FeedNewTabPageTest in android-pie-x86-fyi-rel"

This reverts commit 893bb04d.

Reason for revert: Test now fully disabled in https://chromium-review.googlesource.com/c/chromium/src/+/2122463

Original change's description:
> android: disable one FeedNewTabPageTest in android-pie-x86-fyi-rel
> 
> The test FeedNewTabPageTest#testFeedDisabledByPolicy keeps crashing since
> https://ci.chromium.org/p/chromium/builders/ci/android-pie-x86-fyi-rel/860
> 
> Bug: 1064388
> Change-Id: I9885ed704254197cc024857f41e8bd8930656b81
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121357
> Auto-Submit: Haiyang Pan <hypan@google.com>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#753446}

TBR=jbudorick@chromium.org,hypan@google.com

Change-Id: I12cc58d61768f9a57bb528a0aacd56c2ec9e2a66
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1064388
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121766Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753736}

testing/buildbot/filters/android.emulator.chrome_public_test_apk.filter

@@ -131,6 +131,3 @@
 
 # crbug.com/1064058
 -org.chromium.chrome.features.start_surface.StartSurfaceLayoutTest.testRecycling_aspectRatioPoint75
-
-# crbug.com/1064388
--org.chromium.chrome.browser.feed.FeedNewTabPageTest.testFeedDisabledByPolicy