Avoid looking up the default port in is_default_port when no explicit port is set

[bdraco]

What do these changes do?

Avoid looking up the default port in is_default_port when no explicit port is set

Are there changes in behavior for the user?

no

Related issue number

aio-libs/aiohttp#9366

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.55%. Comparing base (62b52d1) to head (aad487a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1168      +/-   ##
==========================================
- Coverage   95.56%   95.55%   -0.01%     
==========================================
  Files          30       30              
  Lines        4911     4909       -2     
  Branches      446      446              
==========================================
- Hits         4693     4691       -2     
  Misses        192      192              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.51% <100.00%> (-0.01%)	⬇️
MyPy	42.20% <100.00%> (-0.03%)	⬇️
OS-Linux	99.41% <100.00%> (-0.01%)	⬇️
OS-Windows	99.50% <100.00%> (-0.01%)	⬇️
OS-macOS	99.13% <100.00%> (-0.01%)	⬇️
Py-3.10.11	99.02% <100.00%> (-0.01%)	⬇️
Py-3.10.15	99.25% <100.00%> (-0.01%)	⬇️
Py-3.11.10	99.25% <100.00%> (-0.01%)	⬇️
Py-3.11.9	99.02% <100.00%> (-0.01%)	⬇️
Py-3.12.6	99.25% <100.00%> (-0.01%)	⬇️
Py-3.13.0-rc.2	99.25% <100.00%> (-0.01%)	⬇️
Py-3.8.10	98.97% <100.00%> (-0.01%)	⬇️
Py-3.8.18	99.20% <100.00%> (-0.01%)	⬇️
Py-3.9.13	98.97% <100.00%> (-0.01%)	⬇️
Py-3.9.20	99.20% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.11	99.26% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	99.26% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.17	99.29% <100.00%> (-0.01%)	⬇️
VM-macos-latest	99.13% <100.00%> (-0.01%)	⬇️
VM-ubuntu-latest	99.41% <100.00%> (-0.01%)	⬇️
VM-windows-latest	99.50% <100.00%> (-0.01%)	⬇️
pytest	99.41% <100.00%> (-0.01%)	⬇️

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