fix deletion dropping in intra-L0
Summary: `KeyNotExistsBeyondOutputLevel` didn't consider L0 files' key-ranges. So if a key only was covered by older L0 files' key-ranges, we would incorrectly drop deletions of that key. This PR just skips the deletion-dropping optimization when output level is L0. Closes https://github.com/facebook/rocksdb/pull/2726 Differential Revision: D5617286 Pulled By: ajkr fbshipit-source-id: 4bff1396b06d49a828ba4542f249191052915bce
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