Revert uiautomator.jar to that of platforms/android-23

The android-24 was compiled with -target 1.8 :(

BUG=623989

Change-Id: I9f9303e62935ad392c3e305713799055f6b3aa83
Reviewed-on: https://chromium-review.googlesource.com/397639
Reviewed-by: Mike Stipicevic <stip@chromium.org>
Tested-by: Andrew Grieve <agrieve@chromium.org>