23.3 Backport of #49660 - fix sparse columns reload

[Enmk]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fixed reading from sparse columns after changing setting ratio_of_defaults_for_sparse_serialization back to 1.0 and restarting the server. (ClickHouse#49660 by @CurtizJ)

[altinity-robot]

This is an automated comment for commit 0eff70f with description of existing statuses. It's updated for the latest CI running
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