poppler: cairo: Don't override the antialias settings from the cairo_t

This partially reverts commit 853e9499, which made CairoOutputDev store
the antialias setting, and applying it to its cairo context.

Instead, just copy the antialias (and font antialias) setting from the
passed cairo context to newly created contexts.  That way, the application
can control the antialias settings.

Use this in pdftocairo to implement its -antialias option.

https://bugs.freedesktop.org/show_bug.cgi?id=94977
poppler/poppler!89
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