Fix UAT hostname for permitted origins

[jcoyne]

No description provided.

[corylown]

All of these resolve for me:

• https://sul-stacks-uat.stanford.edu/
• https://stacks-uat.stanford.edu/
• https://sul-stacks-stage.stanford.edu/
• https://stacks-stage.stanford.edu/

Is there a reason to prefer one form over another?

[jcoyne]

@corylown without this change it was rejecting the responses. stacks-uat is the A record and sul-stacks-uat is a CNAME:

➜  dig sul-stacks-uat.stanford.edu
...
;; ANSWER SECTION:
sul-stacks-uat.stanford.edu. 1800 IN	CNAME	stacks-uat.stanford.edu.
stacks-uat.stanford.edu. 1800	IN	A	171.67.37.199

If you go to purl uat, and get a manifest (i.e. https://sul-purl-uat.stanford.edu/bb112zx3193/iiif/manifest) , you see it points at stacks-uat.stanford.edu