Remove special redefinition of \sout.

This used to be necessary to avoid problems with hyperref,
when headings contain strikeout text, but it does not seem to be
necessary any more (tested).

data/templates/default.latex

@@ -381,8 +381,6 @@ $if(csquotes)$
 \usepackage{csquotes}
 $endif$
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
-% Avoid problems with \sout in headers with hyperref
-\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 \hypersetup{
 $if(title-meta)$
   pdftitle={$title-meta$},

test/lhs-test.latex

@@ -81,8 +81,6 @@
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
-% Avoid problems with \sout in headers with hyperref
-\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 \hypersetup{
   hidelinks,
   pdfcreator={LaTeX via pandoc}}

test/lhs-test.latex+lhs

@@ -48,8 +48,6 @@
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
-% Avoid problems with \sout in headers with hyperref
-\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 \hypersetup{
   hidelinks,
   pdfcreator={LaTeX via pandoc}}

test/writer.latex

@@ -59,8 +59,6 @@
   \usepackage{selnolig}  % disable illegal ligatures
 \fi
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
-% Avoid problems with \sout in headers with hyperref
-\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 \hypersetup{
   pdftitle={Pandoc Test Suite},
   pdfauthor={John MacFarlane; Anonymous},

test/writers-lang-and-dir.latex

@@ -64,8 +64,6 @@
   \newenvironment{LTR}{\beginL}{\endL}
 \fi
 \IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
-% Avoid problems with \sout in headers with hyperref
-\pdfstringdefDisableCommands{\renewcommand{\sout}{}}
 \hypersetup{
   pdflang={en},
   hidelinks,