fix: restore ability to override auth and token urls for exemplary app

[dpeckett]

Restore ability to override auth and token urls for exemplary app, looks like this was accidentally broken in the past.

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

[codecov]

Codecov Report

Merging #3590 (a8f0220) into master (749eb8d) will decrease coverage by 0.04%.
Report is 1 commits behind head on master.
The diff coverage is 0.00%.

❗ Current head a8f0220 differs from pull request most recent head 18eb2bc. Consider uploading reports for the commit 18eb2bc to get more accurate results

@@            Coverage Diff             @@
##           master    #3590      +/-   ##
==========================================
- Coverage   76.41%   76.38%   -0.04%     
==========================================
  Files         130      130              
  Lines        9714     9739      +25     
==========================================
+ Hits         7423     7439      +16     
- Misses       1792     1797       +5     
- Partials      499      503       +4     

Files Changed	Coverage Δ
cmd/cmd_perform_authorization_code.go	13.25% <0.00%> (-0.30%)	⬇️

... and 2 files with indirect coverage changes

[aeneasr]

Awesome, thank you! 🎉 Your contribution makes Ory better :)