vim-patch:0977c8b: runtime(vim): Update base syntax, contain user command replacement text (#35979)

Ensure that :command replacement text terminates at the end of the
logical line.

Add :command to the generator exclusion list.

fixes: vim/vim#18414 (@Dougaak)
fixes: vim/vim#18448 (Maxim Kim)
closes: vim/vim#18415

0977c8b03e

Co-authored-by: Doug Kearns <dougkearns@gmail.com>

runtime/syntax/vim.vim

@@ -851,6 +851,7 @@ syn region	vimUserCmdReplacement contained
       \ skip=+\n\s*\%(\\\|["#]\\ \)+
       \ end="$"
       \ contains=@vimContinue,@vimUserCmdList,vimComFilter
+      \ keepend
 syn region	vimUserCmdBlock	    contained
       \ matchgroup=vimSep
       \ start="{"