[ChromeDriver] Increase target height in touch_action_tests.html file

Increasing target height in touch_action_tests.html fixes the bug
in testTouchScrollElement.

Bug: chromedriver:2738
Change-Id: I11087c8f15e71c52b529427300301835e43aa9a1
Reviewed-on: https://chromium-review.googlesource.com/c/1416402
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Artur Khachatryan <khachatryan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623554}
1 file changed