demux_playlist: fix comparison for current file if it's in current dir

When the file is in the current working directory, stream->path points
directly to the path, while path includes "./". So strip it to make the
comparison work.

Neither include "./" in any other situation.

Fixes: c201c48

demux/demux_playlist.c

@@ -416,6 +416,11 @@ static bool test_path(struct pl_parser *p, char *path, int autocreate)
     if (autocreate & AUTO_ANY)
         return true;
 
+    // When opening a file from cwd, 'path' starts with "./" while stream->path
+    // does not. Strip it to make the comparison work.
+    if (strncmp(path, "./", 2) == 0 && !mp_path_is_absolute(bstr0(p->real_stream->path)))
+        path += 2;
+
     if (!strcmp(path, p->real_stream->path))
         return true;