MDEV-39861 innodb_log_recovery_target wrongly opens log in read-write mode

[dr-m]

log_t::archived_switch_recovery_prepare(): Observe recv_sys.rpo similar to what recv_sys_t::find_checkpoint() does.

This is based on b98be03 from #4817 which fixed an intermittent failure of the test backup.backup_innodb on Microsoft Windows.

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[gemini-code-assist]

Code Review

This pull request modifies the file creation logic in log0recv.cc by removing the int{} cast from i->second.access and adding recv_sys.rpo as an alternative condition. The reviewer points out that removing the cast could lead to compilation issues if access is a strongly-typed enum, and suggests comparing it directly to READ_ONLY for improved readability and type safety.

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