PDF: fix regression with typst and smart quotes.

Before 3.8, the default behavior when producing a PDF `-t typst`
was to produce smart quotes according to typst's defaults.
(This could be defeated by specifying `-t typst-smart`.)

This behavior broke in 3.8 because of a change to Text.Pandoc.PDF.
This change caused `smart` to be disabled for all formats when
producing PDFs, when before it was only disable for TeX-based
formats (to avoid bad ligatures).

This commit restores the old behavior. Possibly the regression also
other affects other non-TeX formats, e.g. HTML.

Closes #11256.

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