fixed: correct tag for episodeguide URL

XBMC change the tag from "episodeguideurl" to:
<episodeguide>
<url
cache="73388.xml">http://www.thetvdb.com/api/1D62F2F90030C444/series/73388/all/en.zip</url>
</episodeguide>

But it also works with:

<episodeguide>http://www.thetvdb.com/api/1D62F2F90030C444/series/73388/all/en.zip</episodeguide>