fix(http): show hostname as 'localhost' for 0.0.0.0 on windows

[kt3k]

This PR shows hostname as localhost on windows when the server listens at 0.0.0.0.

This substitution of the hostname used to be done by CLI, but we stopped doing that when onListen handler is set in denoland/deno#24777

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.25%. Comparing base (149839b) to head (33c10af).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
http/file_server.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5918   +/-   ##
=======================================
  Coverage   96.25%   96.25%           
=======================================
  Files         491      491           
  Lines       39440    39443    +3     
  Branches     5811     5811           
=======================================
+ Hits        37961    37964    +3     
  Misses       1435     1435           
  Partials       44       44           

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