[Android Compile Bot] Look at the start_dir for trigger_wait_ac_task.py

Noticed this when trybots were not using changes to
trigger_wait_ac_task.py

NoTry: true
Bug: skia:7469
Change-Id: Ifac964e247bfd6862fa030fbf5176f179ef7f3c4
Reviewed-on: https://skia-review.googlesource.com/103521
Commit-Queue: Ravi Mistry <rmistry@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
2 files changed