fix: computeHosts doesn't work when listener and route both wildcard

[zirain]

Found this during test TLSRouteHostnameIntersection conformance test, more details could be found here.

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	b4ca52d
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/69843f8f50b70600087d3593

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 73.79%. Comparing base (d85a78e) to head (b4ca52d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/helpers.go	94.44%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8186   +/-   ##
=======================================
  Coverage   73.79%   73.79%           
=======================================
  Files         241      241           
  Lines       36579    36591   +12     
=======================================
+ Hits        26994    27003    +9     
- Misses       7678     7681    +3     
  Partials     1907     1907           

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