runtime(netrw): Use correct "=~#" for the netrw_sizestyle='H' option

Correct expression syntax to match case in if and if-else clauses.

related: #8535
closes: #17901

Signed-off-by: veotos <veotos@users.noreply.github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: veotos

runtime/pack/dist/opt/netrw/autoload/netrw.vim

@@ -1,6 +1,8 @@
 " Creator:    Charles E Campbell
 " Previous Maintainer: Luca Saccarola <github.e41mv@aleeas.com>
 " Maintainer: This runtime file is looking for a new maintainer.
+" Last Change:
+" 2025 Aug 07 by Vim Project (use correct "=~#" for netrw_stylesize option #17901)
 " Copyright:  Copyright (C) 2016 Charles E. Campbell {{{1
 "             Permission is hereby granted to use and distribute this code,
 "             with or without modifications, provided that this copyright
@@ -9225,7 +9227,7 @@ endfunction
 "                       1000 -> 1K, 1000000 -> 1M, 1000000000 -> 1G
 function s:NetrwHumanReadable(sz)
 
-    if g:netrw_sizestyle == 'h'
+    if g:netrw_sizestyle ==# 'h'
         if a:sz >= 1000000000
             let sz = printf("%.1f",a:sz/1000000000.0)."g"
         elseif a:sz >= 10000000
@@ -9240,7 +9242,7 @@ function s:NetrwHumanReadable(sz)
             let sz= a:sz
         endif
 
-    elseif g:netrw_sizestyle == 'H'
+    elseif g:netrw_sizestyle ==# 'H'
         if a:sz >= 1073741824
             let sz = printf("%.1f",a:sz/1073741824.0)."G"
         elseif a:sz >= 10485760