fdo#76710: Adjust sheet position of conditional format entries.

When inserting or deleting sheets.

Change-Id: Ibf898350e22f092ec38b75ad98957832a5580e6a
(cherry picked from commit 146f6e7e68ea56f79b72047b97bd9fba66db499d)
Reviewed-on: https://gerrit.libreoffice.org/9350
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>