Re-factor the PresentationMode handling in BaseViewer.#ensurePageViewVisible
#14871
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Given that we're (ab)using spread-modes in order to ensure that pages are centered vertically in PresentationMode, this re-factoring simplifies the code slightly.
Furthermore, in the event that we possibly want to try and support spread-modes in PresentationMode[1] this re-factoring will also prevent future duplication.
[1] Note that I'm not particularly keen on doing that, since documents with varying page sizes will be annoying to handle.