* MM-21307 Get/Update/Delete user preferences Plugin API * MM-21307 additional test case on TestPluginAPIDeleteUserPreferences * MM-21307 remove useless loop * Update plugin/api.go * Update plugin/api.go * Update plugin/api.go * Update plugin/api.go * Update plugin/api.go * Update plugin/api.go * gofmt -s Co-authored-by: mattermod <mattermod@users.noreply.github.com> Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>