[MM-61506] Fix errcheck issues in server/channels/app/teams/helper_test.go (#29144)

server/.golangci.yml

@@ -159,7 +159,6 @@ issues:
         channels/app/syncables.go|\
         channels/app/team.go|\
         channels/app/team_test.go|\
-        channels/app/teams/helper_test.go|\
         channels/app/upload.go|\
         channels/app/upload_test.go|\
         channels/app/user.go|\