fix: use correct host value in middleware

[aeneasr]

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• 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 approval (please contact [email protected]) 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 the necessary documentation within the code base (if appropriate).

Further comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.73%. Comparing base (071c0ff) to head (ffe4d3a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #316   +/-   ##
=======================================
  Coverage   43.73%   43.73%           
=======================================
  Files         135      135           
  Lines        1932     1932           
  Branches      279      279           
=======================================
  Hits          845      845           
  Misses       1080     1080           
  Partials        7        7           

Components	Coverage Δ
@ory/elements-react	38.14% <ø> (ø)
@ory/nextjs	65.97% <100.00%> (ø)