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/12065
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>