MDEV-6546: innodb.innodb_simulate_comp_failures_small fails

sporadically

Fix: Modify test to be smaller so that testcase timeout does not
trigger. We already have a test for --big-test setup 
(innodb.innodb_simulate_comp_failures).

mysql-test/suite/innodb/t/innodb_simulate_comp_failures_small.test

 --let $num_inserts = 10000
---let $num_ops = 3000
+--let $num_ops = 300
 --source suite/innodb/include/innodb_simulate_comp_failures.inc
 # clean exit
 --exit