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/liquid.vim b/runtime/ftplugin/liquid.vim
index f24ec4c..dbd8abe 100644
--- a/runtime/ftplugin/liquid.vim
+++ b/runtime/ftplugin/liquid.vim
@@ -2,6 +2,7 @@
 " Language:     Liquid
 " Maintainer:   Tim Pope <vimNOSPAM@tpope.org>
 " Last Change:	2022 Mar 15
+"             	2024 May 23 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 
 if exists('b:did_ftplugin')
   finish
@@ -56,6 +57,6 @@
   let b:match_words .= '\<\%(if\w*\|unless\|case\)\>:\<\%(elsif\|else\|when\)\>:\<end\%(if\w*\|unless\|case\)\>,\<\%(for\|tablerow\)\>:\%({%\s*\)\@<=empty\>:\<end\%(for\|tablerow\)\>,\<\(capture\|comment\|highlight\)\>:\<end\1\>'
 endif
 
-setlocal commentstring={%\ comment\ %}%s{%\ endcomment\ %}
+setlocal commentstring={%\ comment\ %}\ %s\ {%\ endcomment\ %}
 
 let b:undo_ftplugin .= 'setl cms< | unlet! b:browsefilter b:match_words'