[docker] Fix build by pointing to correct path

Change-Id: I66ed32fc354a95e50ecaf68708f67592bda25b76
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/357296
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
1 file changed