Minted compatibility patch (#1737)

* Fix #1735 pull request

* LaTeX: workaround to ensure compatibility with minted

This reverts already merged #1735 (after a commit from #1736 to fix it)
and applies the first envisioned method discussed in #1734.

The reason is that the #1735-#1736 method only partially repairs the
minted compatibility.  Minted queries from Pygments the stylesheet
with a command prefix equal to the style name, which may contain
(at least, so far) characters such as - and _, which are not normally
allowed in LaTeX macros.  So it modifies the meaning of - and _ before
telling LaTeX to input the Pygments provided stylesheet.  Restoring
the normal meaning of - from inside the stylesheet must be carefully
localized: at top and bottom of stylesheets some macros will use in
their names the - and there the - must be the weird minted one, not
the normal one.

The #1735-#1736 method thus does fix compatibility with minted but *only*
for those style names not using a -, but it creates another issue if
used with e.g. style "paraiso-dark" which has a - character in its name.

"De guerre lasse", I feel it is simpler to use the somewhat strange
very localized hotfix of prefixing - by \string at the one spot where
we need it to be its normal self.  Hence this PR.

Fix #1734.

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