prog: increase number of itereations in TestRotationCoverage
prog: increase number of itereations in TestRotationCoverage

It failed on CI once:
https://github.com/google/syzkaller/pull/1789/checks?check_run_id=740199305

google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller