Improve the workaround for #1658, adapting a solution by @u-fischer in
<https://github.com/latex3/latex2e/issues/131> that works whether or not
the `indent` variable is enabled.
Remove `subparagraph` variable in LaTeX template. The default is now
to use run-in style for level 4 and 5 headings (`\paragraph` and `\subparagraph`).
To get the previous default behavior (where these were formatted as blocks,
like `\subsubsection`), set the `block-headings` variable.
An example is given in the manual of reformatting the appearance of headings
more thoroughly using KOMA-Script.
Closes#5365.
3d1409347a