[autotest] Tuned playback files for Touch_ScrollDirection Test.

Autotest playback files for touch_ScrollDirection test were
updated. Earlier, the test used to fail on Samus, Mighty, Paine
and Nyan-Big devices. Fine tuned the play back file to suit the
test and ran on the affected boards with 35 iterations. Results
show improvement and failure rate was zero for Samus, Paine and
Mighty. Nyan big has 15% failure rate yet!!

BUG=chromium:482128
TEST=Ran on all affected boards

Change-Id: Icc1c8c8a2ccb3a048b90d326d97850229b0db6eb
Reviewed-on: https://chromium-review.googlesource.com/267785
Tested-by: Dinesh Kumar Sunkara <dsunkara@chromium.org>
Reviewed-by: Katherine Threlkeld <kathrelkeld@chromium.org>
Commit-Queue: Dinesh Kumar Sunkara <dsunkara@chromium.org>
Trybot-Ready: Dinesh Kumar Sunkara <dsunkara@chromium.org>
8 files changed