Remove unnecessary session property from spill test setup
spill_enabled is already set by config.  Don't need session property
also.
@@ -42,7 +42,6 @@ public class TestDistributedSpilledQueries
.setCatalog("tpch")
.setSchema(TINY_SCHEMA_NAME)
.setSystemProperty(SystemSessionProperties.TASK_CONCURRENCY, "2")
- .setSystemProperty(SystemSessionProperties.SPILL_ENABLED, "true")
.setSystemProperty(SystemSessionProperties.AGGREGATION_OPERATOR_UNSPILL_MEMORY_LIMIT, "128kB")
.setSystemProperty(SystemSessionProperties.USE_MARK_DISTINCT, "false")
.build();
