fix: reaction test errcheck issues (#28516)

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

server/.golangci.yml

@@ -96,7 +96,6 @@ issues:
         channels/api4/post_test.go|\
         channels/api4/preference_test.go|\
         channels/api4/reaction.go|\
-        channels/api4/reaction_test.go|\
         channels/api4/remote_cluster.go|\
         channels/api4/role.go|\
         channels/api4/role_test.go|\