Fix owners file.

The owners file was using a keyworkd in uppercase that was not
recognized.

Change-Id: I2afc744532c79cb38b1ab72d9b52e298231defdc
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/4040
Reviewed-by: Keyong Han <keyonghan@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>