patch 9.1.0464: no whitespace padding in commentstring option in ftplugins

Problem:  no whitespace padding in commentstring option in ftplugins
Solution: Change default to include whitespace padding, update
          existing filetype plugins with the new default value
          (Riley Bruins)

closes: #14843

Signed-off-by: Riley Bruins <ribru17@hotmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/ftplugin/xdefaults.vim b/runtime/ftplugin/xdefaults.vim
index c1aff70..26c7516 100644
--- a/runtime/ftplugin/xdefaults.vim
+++ b/runtime/ftplugin/xdefaults.vim
@@ -1,7 +1,8 @@
 " Vim filetype plugin file
-" Language:             X resources files like ~/.Xdefaults (xrdb)
-" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
-" Latest Revision:      2008-07-09
+" Language:		X resources files like ~/.Xdefaults (xrdb)
+" Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
+" Latest Revision:	2008 Jul 09
+"			2024 Jun 03 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists("b:did_ftplugin")
   finish
@@ -13,7 +14,7 @@
 
 let b:undo_ftplugin = "setl com< cms< inc< fo<"
 
-setlocal comments=s1:/*,mb:*,ex:*/,:! commentstring& inc&
+setlocal comments=s1:/*,mb:*,ex:*/,:! commentstring=!\ %s inc&
 setlocal formatoptions-=t formatoptions+=croql
 
 let &cpo = s:cpo_save