use bottommost compression when base level is bottommost
Summary: The previous compression type selection caused unexpected behavior when the base level was also the bottommost level. The following sequence of events could happen: - full compaction generates files with `bottommost_compression` type - now base level is bottommost level since all files are in the same level - any compaction causes files to be rewritten `compression_per_level` type since bottommost compression didn't apply to base level I changed the code to make bottommost compression apply to base level. Closes https://github.com/facebook/rocksdb/pull/3141 Differential Revision: D6264614 Pulled By: ajkr fbshipit-source-id: d7aaa8675126896684154a1f2c9034d6214fde82
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