Use capital income tax noncompliance rate in SS etr/mtry diagnostics

[marcelolafleur]

Fixes #1170.

One-word fix: capital_noncompliance_rate_2D in SS.py was tiled from p.labor_income_tax_noncompliance_rate instead of p.capital_income_tax_noncompliance_rate. This only affects the post-solve etr_ss and mtry_ss diagnostics in the SS output — the solution itself uses the correct rates via household.py and tax.py. No behavior change when the two rates are equal (the default).

Happy to add a changelog entry and version bump if you'd like them in this PR.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.37%. Comparing base (a12ecf5) to head (cd70d8e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1171   +/-   ##
=======================================
  Coverage   73.37%   73.37%           
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  Files          21       21           
  Lines        5374     5374           
=======================================
  Hits         3943     3943           
  Misses       1431     1431           

Flag	Coverage Δ
unittests	73.37% <ø> (ø)

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Files with missing lines	Coverage Δ
ogcore/SS.py	79.02% <ø> (ø)

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