tests: convert all nightly GPU tests from GUID to GID
tests: convert all nightly GPU tests from GUID to GID

As part of the docker commands for the nightly GPU regression tests,
earlier commits inadvertently used GUID instead of GID, where GUID does
not exist.  This causes some failures when run in Jenkins.  This patch
fixes this issue.

Change-Id: I429c079ae3df9fd97a956f23a2fc9baeed3f7377
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/51567
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Reviewed-by: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Bobby R. Bruce <b9dba908ffb6c6d8ffe449cc88b3709c13c485c2@ucdavis.edu>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5