Twitch: Fix <author> on game feeds.

Author: stefansundin

app.rb

@@ -1012,8 +1012,8 @@
 
   @data = JSON.parse(data)
   @user_name = @data["user_name"] || CGI.unescape(user)
-  @user_login = @data["user_login"] || CGI.unescape(user)
-  @alternate_url = Addressable::URI.parse("https://www.twitch.tv/#{@user_login.downcase}").normalize.to_s
+  user_login = @data["user_login"] || CGI.unescape(user)
+  @alternate_url = Addressable::URI.parse("https://www.twitch.tv/#{user_login.downcase}").normalize.to_s
   @data["videos"].reject! { |v| v["is_live"] }
 
   @title = @user_name

views/twitch.atom.erb

@@ -14,7 +14,7 @@
     <title><%= "* " if video["type"] == "highlight" %>[<%= video["duration"].to_duration if video.has_key?("duration") %>] <%= video["title"].to_line.esc %></title>
     <link href="https://www.twitch.tv/videos/<%= video["id"] %>" />
     <updated><%= Time.parse(video["created_at"]) %></updated>
-    <author><name><%= @user_login.esc %></name></author>
+    <author><name><%= (video["user_name"] || @user_name).esc %></name></author>
     <content type="html">
 <%= <<~EOF.esc
   <iframe width="620" height="378" src="#{request.root_url}/twitch-embed.html#autoplay=false&video=#{video["id"]}" allowfullscreen referrerpolicy="no-referrer" style="border: 0;"></iframe>