Add close tag of iframe for oEmbed response (#4745)

* Add close tag of iframe for oEmbed response

* add comma

app/serializers/oembed_serializer.rb

@@ -37,13 +37,16 @@ class OEmbedSerializer < ActiveModel::Serializer
   end
 
   def html
-    tag :iframe,
+    attributes = {
       src: embed_short_account_status_url(object.account, object),
       style: 'width: 100%; overflow: hidden',
       frameborder: '0',
       scrolling: 'no',
       width: width,
-        height: height
+      height: height,
+    }
+
+    content_tag :iframe, nil, attributes
   end
 
   def width