box: fix DDL check for recovery

Commit 71de4b2c ("box: fix schema downgrade replication") introduces
check that decides when DDL is disabled if current schema is not equal
to required schema. This patch adds a condition for DDL operations to be
enabled during recovery, so new bootstrap snapshot can be properly
generated.

Follow-up #9049

NO_DOC=bugfix
NO_TEST=internal
NO_CHANGELOG=internal

Co-authored-by: Vladimir Davydov <vdavydov@tarantool.org>