patch 8.2.3383: Vim9: completion for :disassemble adds parenthesis

Problem:    Vim9: completion for :disassemble adds parenthesis.
Solution:   Don't add parenthesis. (Naohiro Ono, closes #8802)
diff --git a/src/testdir/test_cmdline.vim b/src/testdir/test_cmdline.vim
index 0a71b11..341a0f1 100644
--- a/src/testdir/test_cmdline.vim
+++ b/src/testdir/test_cmdline.vim
@@ -841,9 +841,11 @@
   call assert_equal("\"disas debug Test_cmdline_complete_various", @:)
   call feedkeys(":disas profile Test_cmdline_complete_var\<C-A>\<C-B>\"\<CR>", 'xt')
   call assert_equal("\"disas profile Test_cmdline_complete_various", @:)
+  call feedkeys(":disas Test_cmdline_complete_var\<C-A>\<C-B>\"\<CR>", 'xt')
+  call assert_equal("\"disas Test_cmdline_complete_various", @:)
 
   call feedkeys(":disas s:WeirdF\<C-A>\<C-B>\"\<CR>", 'xt')
-  call assert_match('"disas <SNR>\d\+_WeirdFunc()', @:)
+  call assert_match('"disas <SNR>\d\+_WeirdFunc', @:)
 
   " completion for the :match command
   call feedkeys(":match Search /pat/\<C-A>\<C-B>\"\<CR>", 'xt')