The passed flags in the variable i_flags are now applied to the new node.
This solves bug ticket #3690, where it was possible to delete the "Playlist" and
"Media Library" nodes, since the read-only flag was not set for them.
(cherry picked from commit b0db307c4cf3ac509fe33079f132a0dc6c939e22)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>