db_stress: fix run time error when prefix_size = -1 (#5862)
Summary: When prefix_size = -1, stress test crashes with run time error because of overflow. Fix it by not using -1 but 7 in prefix scan mode. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5862 Test Plan: Run python -u tools/db_crashtest.py --simple whitebox --random_kill_odd \ 888887 --compression_type=zstd and see it doesn't crash. Differential Revision: D17642313 fbshipit-source-id: f029e7651498c905af1b1bee6d310ae50cdcda41
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