Colors were not being escaped properly for windows (which has special non-ANSI color code handling)
Change-Id: I03c34b1205b26b1192af9c05162bbe03035172bd
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/56500
Auto-Submit: Ben Clayton <bclayton@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>