Add user profile OG tag on status page (#21423)

app/views/statuses/show.html.haml

@@ -13,6 +13,7 @@
   = opengraph 'og:title', "#{display_name(@account)} (#{acct(@account)})"
   = opengraph 'og:url', short_account_status_url(@account, @status)
   = opengraph 'og:published_time', @status.created_at.iso8601
+  = opengraph 'profile:username', acct(@account)[1..-1]
 
   = render 'og_description', activity: @status
   = render 'og_image', activity: @status, account: @account