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/csh.vim b/runtime/ftplugin/csh.vim
index a22bee3..74666b9 100644
--- a/runtime/ftplugin/csh.vim
+++ b/runtime/ftplugin/csh.vim
@@ -4,6 +4,7 @@
 " Previous Maintainer:	Dan Sharp
 " Contributor:		Johannes Zellner <johannes@zellner.org>
 " Last Change:		2024 Jan 14
+" 			2024 May 23 by Riley Bruins ('commentstring')
 
 if exists("b:did_ftplugin")
   finish
@@ -14,7 +15,7 @@
 set cpo-=C
 
 setlocal comments=:#
-setlocal commentstring=#%s
+setlocal commentstring=#\ %s
 setlocal formatoptions-=t
 setlocal formatoptions+=crql