composer: fix cdo alias due to command api change (#8828)

plugins/composer/composer.plugin.zsh

@@ -39,7 +39,7 @@ alias crm='composer remove'
 alias ci='composer install'
 alias ccp='composer create-project'
 alias cdu='composer dump-autoload'
-alias cdo='composer dump-autoload --optimize-autoloader'
+alias cdo='composer dump-autoload -o'
 alias cgu='composer global update'
 alias cgr='composer global require'
 alias cgrm='composer global remove'