Fixed errcheck issues in server/channels/api4/group_local.go (#28417)

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>

server/.golangci.yml

@@ -77,7 +77,6 @@ issues:
         channels/api4/export.go|\
         channels/api4/export_test.go|\
         channels/api4/file_test.go|\
-        channels/api4/group_local.go|\
         channels/api4/import_test.go|\
         channels/api4/integration_action_test.go|\
         channels/api4/ip_filtering_test.go|\