Do not inject I/O fault on a retry

We could inject I/O faults during an OTA update for test purpose. But we
should skip the injection if the update is an retry. Otherwise the
update test will simply keeps failing.

Bug: 34159970
Test: Apply the same package on angler and the update succeeds on the 2nd try.
Change-Id: Id274e5475e3bc8d25d50a8cf61a77d2e32c569d6