Diagonal patterns get inverted in shields

Steps to Reproduce:

1. Apply any of the "Per Bend" patterns on a banner;
2. Put it on a shield.

Observed Results:
The pattern is inverted.

Expected Results:
The pattern matches.

Screenshots/Videos attached: Yes

Notes: This is an error with the naming of the regular banner textures, not the shield. That has been reported in MCPE-169579.