Revert 1cd633d6ba (cf. #634)

This did not solve the issue like I thought it would.

doc/vimtex.txt

@@ -584,12 +584,6 @@ Options~
 
   Default value: 1
 
-*g:vimtex_indent_verbatim_envs*
-  Use this option to set a list of verbatim environments in which there should
-  be no automatic indentation.
-
-  Default value: ['verbatim', 'lstlisting', 'minted']
-
 *g:vimtex_index_hide_line_numbers*
   If enabled, then line numbers will be hidden in the index windows.  That is,
   |nonumber| and |norelativenumber| will be set locally.

indent/tex.vim

@@ -12,11 +12,6 @@ let b:did_vimtex_indent = 1
 
 call vimtex#util#set_default('g:vimtex_indent_enabled', 1)
 if !g:vimtex_indent_enabled | finish | endif
-call vimtex#util#set_default('g:vimtex_indent_verbatim_envs', [
-      \ 'verbatim',
-      \ 'lstlisting',
-      \ 'minted',
-      \])
 
 let s:cpo_save = &cpo
 set cpo&vim
@@ -81,15 +76,11 @@ endfunction
 
 " }}}1
 function! s:is_verbatim(line, lnum) " {{{1
-  let l:env = a:line !~# s:is_verbatim_regex
+  let l:env = a:line !~# '\v\\%(begin|end)\{%(verbatim|lstlisting|minted)'
   let l:syn = synIDattr(synID(a:lnum, 1, 1), 'name') ==# 'texZone'
   return l:env && l:syn
 endfunction
 
-let s:is_verbatim_regex = '\v\\%(begin|end)\{%('
-      \ . join(g:vimtex_indent_verbatim_envs, '|')
-      \ . ')'
-
 " }}}1
 
 function! s:indent_envs(cur, prev) " {{{1