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/wat.vim b/runtime/ftplugin/wat.vim
index 35d2d6a..ad1140b 100644
--- a/runtime/ftplugin/wat.vim
+++ b/runtime/ftplugin/wat.vim
@@ -2,6 +2,7 @@
 " Language:     WebAssembly
 " Maintainer:   rhysd <lin90162@yahoo.co.jp>
 " Last Change:  Nov 14, 2023
+"               May 24, 2024 by Riley Bruins <ribru17@gmail.com> ('commentstring')
 " For bugs, patches and license go to https://github.com/rhysd/vim-wasm
 
 if exists("b:did_ftplugin")
@@ -10,7 +11,7 @@
 let b:did_ftplugin = 1
 
 setlocal comments=s:(;,e:;),:;;
-setlocal commentstring=(;%s;)
+setlocal commentstring=(;\ %s\ ;)
 setlocal formatoptions-=t
 setlocal iskeyword+=$,.,/