youtube.lua: be more flexible with JSON spaces

(cherry picked from commit 42b4ab8ae47906466e27e22d25869afccb7ffa0d)
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

share/lua/playlist/youtube.lua

@@ -258,21 +258,21 @@ function parse()
             -- "SWF_ARGS", "swfArgs", "PLAYER_CONFIG", "playerConfig" ...
             if string.match( line, "ytplayer%.config" ) then
 
-                local js_url = string.match( line, "\"js\": \"(.-)\"" )
+                local js_url = string.match( line, "\"js\": *\"(.-)\"" )
                 if js_url then
                     js_url = string.gsub( js_url, "\\/", "/" )
                     js_url = string.gsub( js_url, "^//", vlc.access.."://" )
                 end
 
                 if not fmt then
-                    fmt_list = string.match( line, "\"fmt_list\": \"(.-)\"" )
+                    fmt_list = string.match( line, "\"fmt_list\": *\"(.-)\"" )
                     if fmt_list then
                         fmt_list = string.gsub( fmt_list, "\\/", "/" )
                         fmt = get_fmt( fmt_list )
                     end
                 end
 
-                url_map = string.match( line, "\"url_encoded_fmt_stream_map\": \"(.-)\"" )
+                url_map = string.match( line, "\"url_encoded_fmt_stream_map\": *\"(.-)\"" )
                 if url_map then
                     -- FIXME: do this properly
                     url_map = string.gsub( url_map, "\\u0026", "&" )
@@ -282,7 +282,7 @@ function parse()
                 if not path then
                     -- If this is a live stream, the URL map will be empty
                     -- and we get the URL from this field instead 
-                    local hlsvp = string.match( line, "\"hlsvp\": \"(.-)\"" )
+                    local hlsvp = string.match( line, "\"hlsvp\": *\"(.-)\"" )
                     if hlsvp then
                         hlsvp = string.gsub( hlsvp, "\\/", "/" )
                         path = hlsvp