Update emoji_test.go (fix errcheck issue) (#28440)

Co-authored-by: Mattermost Build <build@mattermost.com>

server/.golangci.yml

@@ -74,7 +74,6 @@ issues:
         channels/api4/config_local.go|\
         channels/api4/config_test.go|\
         channels/api4/data_retention.go|\
-        channels/api4/emoji_test.go|\
         channels/api4/export.go|\
         channels/api4/export_test.go|\
         channels/api4/file_test.go|\