[BUGFIX] Correct LaTeX setup

The LaTeX setup in Settings.yml was copied from extension
"sphinx", which uses some special settings. Furthermore
the extension name was wrong, thus breaking the PDF rendering.

Resolves: #59665
Releases: 1.6
Change-Id: Ib3a726afbdd76baddfbe81144816acbb94145aea
Reviewed-on: https://review.typo3.org/30878
Reviewed-by: Francois Suter
Tested-by: Francois Suter