Regres: Fix testing external contributions if reviewed by Googler

The account info of Gerrit Labels isn't fetched unless the
DETAILED_ACCOUNTS parameter is added to the query:
https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html

This fixes the `canTest` result, setting it to true if either:
- The author is a Googler (was previously working as intended)
- The change has a Code-Review +1 or +2 from a Googler
- The change has a Presubmit-Ready +1 from a Googler

Change-Id: I5cd9881ad38a178fb5bbeb6e4aae4b5a18be9749
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/54948
Tested-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Kokoro-Result: kokoro <noreply+kokoro@google.com>
diff --git a/tests/regres/cmd/regres/main.go b/tests/regres/cmd/regres/main.go
index 963aced..fc56cfb 100644
--- a/tests/regres/cmd/regres/main.go
+++ b/tests/regres/cmd/regres/main.go
@@ -962,7 +962,7 @@
 // update queries gerrit for information about the given change.
 func (c *changeInfo) update(client *gerrit.Client) error {
 	change, _, err := client.Changes.GetChange(c.id, &gerrit.ChangeOptions{
-		AdditionalFields: []string{"CURRENT_REVISION", "CURRENT_COMMIT", "MESSAGES", "LABELS"},
+		AdditionalFields: []string{"CURRENT_REVISION", "CURRENT_COMMIT", "MESSAGES", "LABELS", "DETAILED_ACCOUNTS"},
 	})
 	if err != nil {
 		return cause.Wrap(err, "Getting info for change '%s'", c.id)