lyrics fetcher: update metrolyrics.com fetcher

NEWS

@@ -1,5 +1,6 @@
 ncmpcpp-0.7.2 (????-??-??)
 * Attempt to add non-song item to playlist from search engine doesn't trigger assertion failure anymore.
+* Fetching lyrics from metrolyrics.com was fixed.
 
 ncmpcpp-0.7.1 (2016-01-01)
 * Selected songs in media library can now be added to playlists.

src/lyrics_fetcher.h

@@ -79,7 +79,7 @@ struct MetrolyricsFetcher : public GoogleLyricsFetcher
 	virtual const char *name() const OVERRIDE { return "metrolyrics.com"; }
 	
 protected:
-	virtual const char *regex() const OVERRIDE { return "<div id=\"lyrics-body\">(.*?)</div>"; }
+	virtual const char *regex() const OVERRIDE { return "<div class=\"lyrics-body\">(.*?)</div>"; }
 	
 	virtual bool isURLOk(const std::string &url) OVERRIDE;
 	virtual void postProcess(std::string &data) const OVERRIDE;