Addition of update activity distribution by alias, minor correction (#11905)

* Addition of update activity distribution by alias, minor correction

* Distribute Update activity after adding alias
* Add uniqueness verification to alias uri
* accept acct starting with @

* fix double-quoted to single-quoted

app/controllers/settings/aliases_controller.rb

@@ -15,6 +15,7 @@ class Settings::AliasesController < Settings::BaseController
     @alias = current_account.aliases.build(resource_params)
 
     if @alias.save
+      ActivityPub::UpdateDistributionWorker.perform_async(current_account.id)
       redirect_to settings_aliases_path, notice: I18n.t('aliases.created_msg')
     else
       render :index