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/desktop.vim b/runtime/ftplugin/desktop.vim
index bd6fd70..d15afd2 100644
--- a/runtime/ftplugin/desktop.vim
+++ b/runtime/ftplugin/desktop.vim
@@ -2,6 +2,7 @@
 " Language: XDG desktop entry
 " Maintainer: Eisuke Kawashima ( e.kawaschima+vim AT gmail.com )
 " Last Change: 2022-07-26
+"              2024-05-24 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists('b:did_ftplugin')
   finish
@@ -9,5 +10,5 @@
 let b:did_ftplugin = v:true
 
 setl comments=:#
-setl commentstring=#%s
+setl commentstring=#\ %s
 let b:undo_ftplugin = 'setl com< cms<'