wrap_session: restore old behavior for initstate=1

[blueyed]

The condition for initstate <= 2 was always True, after #4145.

/cc @cacoze

No changelog.

[codecov]

Codecov Report

Merging #5028 into features will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           features    #5028      +/-   ##
============================================
+ Coverage     96.06%   96.06%   +<.01%     
============================================
  Files           114      114              
  Lines         25749    25757       +8     
  Branches       2550     2551       +1     
============================================
+ Hits          24736    24744       +8     
  Misses          704      704              
  Partials        309      309

Impacted Files	Coverage Δ
testing/test_pdb.py	99.18% <100%> (ø)	⬆️
src/_pytest/main.py	96.04% <100%> (ø)	⬆️
testing/test_runner.py	96.96% <100%> (+0.04%)	⬆️

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