Fix DDL tests when MIP map support not available

Change-Id: I6f6b7d7401967aff1ab7444d0f4a594f530a7a6e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212990
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed