Removes <description> tag from rss entries for timeline tweets, as that is almost always a duplicate of the content in the <title> tag

[ghobs91]

Example below from https://nitter.moomoo.me/NatalieHilder/rss

<title>A fascinating depiction of foreigners in ancient Egypt—including Libyans, Nubians, and Asiatics (Canaanites)—found in the tomb of #Horemheb in #Saqqara.
#Egypt #ancientEgypt #traveltoEgypt #Archaeology #Egyptology #Egyptiantomb</title>

<dc:creator>@NatalieHilder</dc:creator>

<description><![CDATA[<p>A fascinating depiction of foreigners in ancient Egypt—including Libyans, Nubians, and Asiatics (Canaanites)—found in the tomb of <a href="http://nitter.moomoo.me/search?q=%23Horemheb">#Horemheb</a> in <a href="http://nitter.moomoo.me/search?q=%23Saqqara">#Saqqara</a>.<br>

[zedeus]

The description contains links and media unlike the title, so it's not a duplicate at all. There has been discussion about whether the title shuold contain the entire tweet, and it's sort of inconclusive: #493