indent/tex.vim: fix \item indentation

    when the first \item spans two lines, set the indentation of the
    next \item correctly (subtract 6 chars '\item ' from the
    indentation)
typo in a compiler message: by Ignas Anikevicius
Merge branch 'master' of https://git.code.sf.net/p/atp-vim/code
indente/tex.vim: revert changes