fix: disable appending of success_cmd on windows since escaping does …

…not (lervag#2085)

work.

Co-authored-by: Nicholas Schwab <git@nicholas-schwab.de>

autoload/vimtex/compiler/latexmk.vim

@@ -629,7 +629,7 @@ function! s:wrap_option_appendcmd(name, value) abort " {{{1
   " Do not use with $ in value. On linux, we use double quoted perl strings
   " that interpolate.
   return has('win32')
-        \ ? ' -e "$' . a:name . ' = ($' . a:name . ' ? $' . a:name . ' . '' & '' : '''') . ''' . a:value . '''"'
+        \ ? vimtex#compiler#latexmk#wrap_option(a:name, a:value)
         \ : ' -e ''$' . a:name . ' = ($' . a:name . ' ? $' . a:name . ' . " ; " : "") . "' . a:value . '"'''
 endfunction