Update tbi_*_expect.txt results given fix of DependentCredit phase-out logic

[martinholmer]

This pull request updates the taxcalc/tests/tbi_puf_expect.txt and the taxcalc/tests/tbi_cps_expect.txt test results files to reflect the effects of the fix in the dependent credit phase-out logic in pull request #1937.

The changes in results are very small. For example, when using puf.csv input data, the current-law 2020 aggregate income tax liability declines by about 0.02 percent (that is, by one-fiftieth of one percent). The bug-fix causes the test reform results to change by roughly the same amount. As a result, the change in the reform difference in 2020 aggregate income tax liability is only about 0.003 percent (that is, three one-thousandths of one percent).

[codecov-io]

Codecov Report

Merging #1945 into master will not change coverage.
The diff coverage is n/a.

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  Coverage     100%    100%           
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  Files          38      38           
  Lines        3726    3726           
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  Hits         3726    3726

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