tests/pull-repeated: Bump up retries to match max fails
tests/pull-repeated: Bump up retries to match max fails

This test keeps occasionally failing in CI - as expected, because
we retry 8 times for an object but it's completely possible for
us to hit the <0.5% chance of 50% failure 8 times in a row.

Since the max errors from the server is 100, set retries to the
same thing.

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree