youtube: also accept https links (might fix #4526).

(cherry picked from commit 01356cfbd1b3ad567aa391245f3ba218a3b13048)
Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr>

share/lua/playlist/youtube.lua

@@ -35,7 +35,7 @@ end
 
 -- Probe function.
 function probe()
-    if vlc.access ~= "http" then
+    if vlc.access ~= "http" and vlc.access ~= "https" then
         return false
     end
     options = {":demux=avformat,ffmpeg"}