Calibrate the itemized deduction for medical expenses

[MaxGhenis]

Treasury's tax expenditures report projects that the itemized deduction for medical expenses costs $12.9 billion in 2024, compared to our $5.5 billion.

Currently we're only calibrating to medical expenses total (SNAP motivated it). Let's also calibrate to the itemized deduction, which only applies to expenses in excess of 7.5% of AGI.