project.config: remove trybot-result-changers

The group description says:

"Accounts that can delete TryBot result votes to restart the TryBots."

But in fact, anyone with remove reviewer permissions can delete the vote, per http://b/245706858. And due to a config error, they're only allowed to vote -1, which I think we can safely assume nobody wants.

Change-Id: I94062a2fe89611b401017a27237f509627c9c8e5
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/456675
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

groups

diff --git a/groups b/groups
index 48a19d2..5048d57 100644
--- a/groups
+++ b/groups
@@ -1,6 +1,5 @@
 # UUID                                                        	Group Name
 #
-28af6c56d29f40fcca6fef99686e58212a7177bf                      	zzz_deleted_trybot-result-changers
 50396072908fc1bf97ed3163533dc7c7381bdbfb                      	may-start-trybots
 69728fadfa4b65b76c1ab6279e3811c7bac871ca                      	gobot
 a68e77fe594e959daaacc2fb670298964f78acfa                      	approvers

project.config

diff --git a/project.config b/project.config
index db9f9ed..b14b252 100644
--- a/project.config
+++ b/project.config
@@ -36,7 +36,6 @@
 	label-Run-TryBot = +0..+1 group may-start-trybots
 	editHashtags = group approvers
 	editHashtags = group gobot
-	labelAs-TryBot-Result = -1..-1 group zzz_deleted_trybot-result-changers
 	label-TryBot-Result = -1..+1 group gobot
         label-TryBot-Bypass = +0..+1 group approvers
 	label-Auto-Submit = +0..+1 group approvers