Revert "Screenshot after devicelab test"

This reverts commit 7f40b154b4d7c67889c9d219ed8029606c515279.

Reason for revert: Broke the build, we need to specify the device ID.

Original change's description:
> Screenshot after devicelab test
>
> This is intended to help particularly if the test fails for some
> unexpected reason, for example it doesn't find an observatory port.
>
> Bug:https://github.com/flutter/flutter/issues/83939
> Change-Id: I67c4f28de72f971537b0514be79a65aa2b65f4be
> Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/14400
> Commit-Queue: Dan Field <dnfield@google.com>
> Reviewed-by: Godofredo Contreras <godofredoc@google.com>

TBR=zra@google.com,godofredoc@google.com,flutter-scoped@luci-project-accounts.iam.gserviceaccount.com,dnfield@google.com

Change-Id: I791d1be701d9da30cb91147b2366d014d5a75676
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: https://github.com/flutter/flutter/issues/83939
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/14420
Reviewed-by: Dan Field <dnfield@google.com>
Commit-Queue: Dan Field <dnfield@google.com>