Fix label permissions for Presubmit-BoringSSL-Verified

I had intended to only let the bot vote +1 on this label, and not
allow human users to vote +1 manually. But it seems this does not work,
as the CV PostAction is failing with "all votes failed":
https://luci-change-verifier.appspot.com/ui/run/boringssl/8848666313854-1-cd1eaded4dff834d

Change-Id: I6039491c044bfcfcfc5a40a950acb2ecdcfc0fe9
Reviewed-on: https://boringssl-review.googlesource.com/c/All-Projects/+/91367
Reviewed-by: Adam Langley <agl@google.com>

project.config

diff --git a/project.config b/project.config
index c470160..bcb6216 100644
--- a/project.config
+++ b/project.config
@@ -38,7 +38,7 @@
 	label-Commit-Queue = +0..+1 group dev
 	labelAs-Commit-Queue = +0..+2 group boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com
 	label-Presubmit-BoringSSL-Verified = -1..+1 group Project Owners
-	label-Presubmit-BoringSSL-Verified = -1..0 group cria/project-boringssl-committers
+	label-Presubmit-BoringSSL-Verified = -1..+1 group cria/project-boringssl-committers
 	labelAs-Presubmit-BoringSSL-Verified = -1..+1 group boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com
 	submit = group Project Owners
 	submit = group boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com