Update default calibration

[jdebacker]

This PR updates the default calibration for the OG-USA model. Changes include:

1. A fix to macro_params.py, which corrects double counting of social security payments when determining the $\alpha_G$ parameter. As a result, $\alpha_G$ is significantly larger.
2. Changes default start year to 2025
3. Updates AIME breakpoints for 2024 values
4. Rounds numbers to 2-4 digits, depending on the parameter.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 45.22%. Comparing base (42a4ff8) to head (a973a1f). Report is 15 commits behind head on master.

Additional details and impacted files

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[rickecon]

@jdebacker. I just have the one question about updating values in the ogusa_default_parameters.json instead of updating them in the sample run script. The current status of this PR is good to go, but I think I would prefer moving those changes to the ogusa_default_parameters.json file. Let me know what you think, and I'll merge this.

[jdebacker]

@rickecon Thanks for the review. I just made the suggested changes.

[rickecon]

@jdebacker. This looks great. Merging.