[3.0] youtube.lua: update "n" descrambling function name parsing

The descrambling function is now called through an intermediate array variable. This change has also added two extra ways to recover the function name. Add support to parse and resolve any of them.

Fixes #26574 (closed)

(cherry picked from commit 3df28fc5) Signed-off-by: Jean-Baptiste Kempf jb@videolan.org