vim-patch:9.1.0366: filetype: ondir files are not recognized

Problem:  filetype: ondir files are not recognized
Solution: Detect '.ondirrc' as ondir filetype
          (Jon Parise)

closes: vim/vim#14604

ea999037a4

Co-authored-by: Jon Parise <jon@indelible.org>

runtime/lua/vim/filetype.lua

@@ -1503,6 +1503,7 @@ local filename = {
   ['.octaverc'] = 'octave',
   octaverc = 'octave',
   ['octave.conf'] = 'octave',
+  ['.ondirrc'] = 'ondir',
   opam = 'opam',
   ['pacman.log'] = 'pacmanlog',
   ['/etc/pam.conf'] = 'pamconf',