Only re-indent after rewriting asserts in Py <3.11

[AndydeCleyre]

I don't know if or why this makes sense, but it seems to get tests running and passing across Python versions, fixing #352.

Please have a look. Maybe there's a better change to make, but I hope this will be useful in the process of figuring that out.

[codecov]

Codecov Report

Base: 84.92% // Head: 84.88% // Decreases project coverage by -0.03% ⚠️

Coverage data is based on head (5e4eefb) compared to base (ce9464d).
Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #353      +/-   ##
==========================================
- Coverage   84.92%   84.88%   -0.04%     
==========================================
  Files          21       21              
  Lines        1844     1846       +2     
  Branches      283      284       +1     
==========================================
+ Hits         1566     1567       +1     
  Misses        236      236              
- Partials       42       43       +1     

Impacted Files	Coverage Δ
ward/_rewrite.py	97.26% <80.00%> (-1.34%)	⬇️

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[darrenburns]

Thank you for digging into this. Looks good.

[AndydeCleyre]

I still don't know for sure if the behavior change in Python was entirely intentional. If not, it might get reverted....