vim-patch:9.0.2063: pacman hooks are detected as conf filetype

Problem:  pacman hooks are detected as conf filetype
Solution: make it consistent to pacman.conf and detect those
          hooks as confini

Because confini has much better syntax highlighting than conf.

For reference, I identified pacman.conf and pacman hooks as dosini in
https://github.com/vim/vim/pull/6335, then
https://github.com/vim/vim/pull/10213 changed them to conf, then
https://github.com/vim/vim/pull/10518 changed pacman.conf to confini but
forgot to change hooks.

closes: vim/vim#13399

7d254dbc2d

Co-authored-by: Guido Cella <guido@guidocella.xyz>

runtime/lua/vim/filetype.lua

@@ -282,7 +282,7 @@ local extension = {
   atg = 'coco',
   recipe = 'conaryrecipe',
   hook = function(path, bufnr)
-    return M._getline(bufnr, 1) == '[Trigger]' and 'conf' or nil
+    return M._getline(bufnr, 1) == '[Trigger]' and 'confini' or nil
   end,
   nmconnection = 'confini',
   mklx = 'context',

test/old/testdir/test_filetype.vim

@@ -1388,12 +1388,12 @@ func Test_hook_file()
 
   call writefile(['[Trigger]', 'this is pacman config'], 'Xfile.hook', 'D')
   split Xfile.hook
-  call assert_equal('conf', &filetype)
+  call assert_equal('confini', &filetype)
   bwipe!
 
   call writefile(['not pacman'], 'Xfile.hook')
   split Xfile.hook
-  call assert_notequal('conf', &filetype)
+  call assert_notequal('confini', &filetype)
   bwipe!
 
   filetype off