ninja-fix: Fix SSTable format randomization using config instead of d…

[shruti-p-s]

…ead SSTABLE_FORMAT_DEFAULT property for CASSANDRA-21177

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The Cassandra Jira

[frankgh]

It looks like this is only used from test/simulator/main/org/apache/cassandra/simulator/ClusterSimulation.java

[maedhroz]

+1