[Pinpoint] prevent try job priority from defaulting to -1
[Pinpoint] prevent try job priority from defaulting to -1

Bug: chromium:1363444
Change-Id: If668567a552c5b9359b80e9723c9393ae9f19ee3
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/3979373
Commit-Queue: Leina Sun <4dc7485e04f6a3a1d05495d5781efc53aef710e0@google.com>
Reviewed-by: Wenbin Zhang <45ad8a1ff616a38a2202fd35571df81897c5f14f@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult