Summary:
Closing https://github.com/facebook/rocksdb/issues/10080

When `SyncWAL()` calls `MarkLogsSynced()`, even if there is only one active WAL file,
this event should still be added to the MANIFEST.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/10087

Test Plan: make check

Reviewed By: ajkr

Differential Revision: D36797580

Pulled By: riversand963

fbshipit-source-id: 24184c9dd606b3939a454ed41de6e868d1519999