pw_draw: Fix unicode string printing

Change-Id: Iae80433e86e40d83fb0ae5758797a4f4d40e320a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/94922
Reviewed-by: Armando Montanez <amontanez@google.com>
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
7 files changed