Youtube: fix playback of recent pages

(cherry picked from commit 7529f9c0c3d4418a1bc0af2640ce24c450f0e9b1)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

share/lua/playlist/youtube.lua

@@ -89,7 +89,9 @@ function js_descramble( sig, js_url )
         -- HTTP request later
         table.insert( lines, line )
         -- c&&(b.signature=ij(c));
-        descrambler = string.match( line, "%.signature=(.-)%(" )
+        -- descrambler = string.match( line, "%.signature=(.-)%(" )
+        -- descrambler = string.match( line, "%.sig%|%|(.-)%(" )
+        descrambler = string.match( line, "%.sig||([a-zA-Z0-9]+)%(" )
     end
 
     -- Fetch the code of the descrambler function. The function is