twitter api: add "Video" to supported activity types list

lib/pleroma/web/twitter_api/views/activity_view.ex

@@ -301,7 +301,8 @@ def render_content(%{"type" => "Note"} = object) do
     {summary, content}
   end
 
-  def render_content(%{"type" => object_type} = object) when object_type in ["Article", "Page"] do
+  def render_content(%{"type" => object_type} = object)
+      when object_type in ["Article", "Page", "Video"] do
     summary = object["name"] || object["summary"]
 
     content =