[animationworklet] Mark worklet-animation-currentTime.html as flaky

In crrev.com/c/1343558 I incorrectly marked an innocent test as flaky.

TBR=hiroshige@chromium.org

Bug: 910297
Change-Id: Ide4bd6e50c4a4a89f577367d640939efedbb30df
Reviewed-on: https://chromium-review.googlesource.com/c/1355776Reviewed-by: Yi Gu <yigu@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612402}

third_party/blink/web_tests/TestExpectations

@@ -5623,7 +5623,7 @@ crbug.com/886566 http/tests/csspaint/invalidation-border-image.html [ Pass Timeo
 crbug.com/886566 http/tests/csspaint/invalidation-content-image.html [ Pass Timeout ]
 
 # Enable AnimationWorklet tests for mainthread
-crbug.com/785940 [ Release ] animations/animationworklet/worklet-animation-local-time-after-duration.html [ Pass Failure ]
+crbug.com/785940 [ Release ] animations/animationworklet/worklet-animation-currentTime.html [ Pass Failure ]
 crbug.com/887659 virtual/threaded/animations/animationworklet/worklet-animation-local-time-after-duration.html [ Failure ]
 
 # Sheriff 2018-09-25