Resolves: fdo#83588 Revert "center slide after changing zoom"

This reverts commit b179235f702e474b115ca479b603052f422346fd.

(cherry picked from commit d1e9aa23a7b74e153479e0e23aac1c02cca48177)

Change-Id: Ifb9444e77a28ac17e4dcc17725a4393ea0aa294e
Reviewed-on: https://gerrit.libreoffice.org/12064
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>